A phone company offers two monthly charge plans. In Plan A, the customer pays a monthly fee of 20 and then an additional .08 cents per minute of use. In Plan B, the customer pays a monthly fee of 22.10 and then an additional 0.07 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.

Question

A phone company offers two monthly charge plans. In Plan A, the customer pays a monthly fee of 20 and then an additional .08 cents per minute of use. In Plan B, the customer pays a monthly fee of 22.10 and then an additional 0.07  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.

anonymous · Answer

Plan A: 20 + 0.08m
Plan B: 22.1 + 0.07m

Since we want to know when will Plan A < Plan B
20+0.08m < 22.1+0.07m
0.01m < 2.1
m < 210

anonymous · Answer

Thank you!