Please answer this question

Question

A phone company offers two monthly charge plans. In Plan A, there is no monthly fee, but the customer pays 6 cents per minute of use. In Plan B, the customer pays a monthly fee of $2.80 and then an 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

Plan A: cost = 0.06m

Plan B: cost = 0.04m+2.80

0.06m > 0.04m+2.80

Subtract 0.04m from both sides

0.02m > 2.80

Divide both sides by 0.02

m > 140

For monthly phone usage greater than 140 minutes, Plan A will cost more than Plan B.