ABC Telephone has a special long distance telephone rate. The first 10 minutes of a call cost $0.15 per minute. Each additional minute is only $0.05 a minute. How much would a 35-minute call cost?
First you're going to subtract 35-10 to get 25, which you then have to calculate how many minutes you have left.
The amount you currently owe is
Next, we have to figure out how much the remaining 25 minutes cost you. That is
Now, add up
A 35-minute call would cost