SOLUTION: Here is another problem I am having difficulty figuring out:1) A customer has to decide between 2 phone plans A and B he wants to know which plan is better 2) The customer wa

Question 428044: Here is another problem I am having difficulty figuring out:1) A customer has to decide between 2 phone plans A and B he wants to know which plan is better
2) The customer wants to know the best plan knowing that he uses the phone several times a day , he estimates that he uses the phone more than 2000 minutes a month
3)
Each plan has the following costs:
Plan A: 700 minutes for $100, with each additional minute costing .45.
Plan B:1400 minutes for $120, and each additional minute costing .40
I have figured out most of the problem by using the substitution method, but I can't seem to get the x an y intercepts for the table of values to correctly align with the problem. Can someone point me in the right direction?
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
2) The customer wants to know the best plan knowing that he uses the phone several times a day , he estimates that he uses the phone more than 2000 minutes a month
3)
Each plan has the following costs:
Plan A: 700 minutes for $100, with each additional minute costing .45.
A(x) = 100 + 0.45(x-700)
A(2000) = 100 + 0.45*1300 = $685
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Plan B:1400 minutes for $120, and each additional minute costing .40
B(x) = 120 + 0.40(x-1400)
B(2000) = 120 + 0.40*600 = $360
---
Plan B is better at 2000 minutes
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Cheers,
Stan H.
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