Question 996312
Let's call the minutes x:
Company A:
12+0.10x
Company B:
0.15x When will costs be the same? When A=B:
12+0.10x=0.15x Now subtract 0.10x from both sides:
12= 0.05x
Divide both sides by 0.05:
x=240 At 240 minutes both will cost you the same. 
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Now, every minute OVER 240 will cost you 0.10 with A and 0.15 with B, therefore if you are going to use more than 240 minutes choose A.
On the other hand, if you are going to use LESS than 240 minutes... what happens? Let's pretend you will use 200 minutes:
A)12+0.10(200)= 32
B)0.15(200)= 30
So, as you can see, if you use less than 240 minutes B is cheaper.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             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