A phone company offers two monthly charge plans. In Plan A, the customer pays a monthly fee of

$30

and then an additional

9

cents per minute of use. In Plan B, the customer pays a monthly fee of

$36

and then an additional

7

cents per minute of use.

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

Use

m

for the number of minutes of phone use, and solve your inequality for

m

.