SOLUTION: A mobile phone company offers two monthly calling plans, A and B. Under A, every
minute costs $ 0.10. Under B, the first 100 minutes costs $ 12 and every extra minute costs $ 0.08
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Question 357006: A mobile phone company offers two monthly calling plans, A and B. Under A, every
minute costs $ 0.10. Under B, the first 100 minutes costs $ 12 and every extra minute costs $ 0.08. What monthly talking time would make B the better choice?
Answer by mananth(16946) (Show Source): You can put this solution on YOUR website!
let x be the number of calls made in a month.
PLAN A billing = 0.10x
PLAN B billing =12 +0.08x
12+0.08x<0.10x
12<0.10x-0.08x
(12<0.02x)
((12/0.02)
...
((600
...
(for (x> 600) plan B is better)
m.ananth@hotmail.ca
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