Story problem

Question

Local cell phone company offers two different calling plans.  In the first plan, you pay a monthly fee of %30 and $0.35 per minute.  In the second plan you pay monthly fee of $99 and $0.05 per minute. When is it better to use the first calling plan? When is it best to use the second calling plan? When will they be equal?

 

Answer 1

30+.35m =99+.05m

.3m = 69

m=230 minutes makes both cost $110.50

2nd plan is cheaper if you use more than 230 minutes