A phone company offers, two monthly charge plans. In Plan A, there is no monthly fee, but the customer pays 7 cents per minute of use.

Question

A phone company offers, two monthly charge plans. In Plan A, there is no monthly fee, but the customer pays 7 cents per minute of use. In Plan B, the customer pays a monthly fee of $20.70 and then a additional 4 cents per minute of use. 

For what amounts of monthly phone use will Plan A cost more than Plan B? 

Use m for the number of minutes of phone use in a month, and solve your inequality for m.

Answer 1

A > B

0.07m > 20.70 + 0.04m

Can you solve for m and answer?

Answer 2

Hello Jocelyn, Plan A costs $0.07m and Plan B costs $20.70 + 0.04m. Set those two formulas equal and solve for m to find out in how many months the two plans cost the same. After that, figure out whether Plan A is the better choice for numbers above this value of m or numbers below this value of m using common sense or by checking a value for m above and below this value of m. Tom S.