A basic cellular package costs$30/month for60minutes of callingwith an additional charge of$0.50/minute beyond that time. The cost functionC(x) for usingx minutes would be

• If you used 60 minutes or less, i.e. ififx60,thenC(x)=30 (the base charge).
• If you used more than 60 minutes, i.e.(x60) minutes more than the plan came with, you would pay an additional$0.50 for each of those(x60) minutes. Your total bill would beC(x)=30+0.50(x60)

If you want to keep your bill at$50 or lower for the month, what is the maximum number of calling minutes you can use?

The maximum calling minutes you can use is _______minutes.