Molly's basic cell phone plan charges $35.99 for service plus $0.21 per minute beyond the included 250 minutes in the plan. How much will it cost if she used her cell phone for 480 minutes in one month?

Question

anonymous · Answer

Cost = 35.99 + 0.21*(480-250)

anonymous · Answer

If she pays the $35.99, she gets 250 minutes included.  So if she uses 480, that's an additional 480-250=230 minutes that she has to pay extra for.  The extra is $0.21 per minute, so her total charge will be $35.99+$0.21(230).