You have a wireless phone plan that costs $25 per month. You must also pay $.10 per minute for each minute over 500 min. you phone bill was more than $30 last month. Write an inequality to represent the number of minutes m you spent on the phone last month. Suppose you use 525 min next month. How much will your bill be?

Answer 1

The equation for your cost:

cost = .1(m-500) + 25 , where m is in minutes

so :
.1(m-500) + 25 > 30

For the second part, m = 525
cost = .1(525-500) + 25
= $27.50

Answer 2

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