To make a call from a payphone, you must pay $0.25 for each minute of your call. After 16 minutes, that price drops to $0.2 per minute. How much would a 36-minute call cost?
First 16 minutes would be a cost of 16 * 0.25 = $<<16*0.25=4>>4.
After that, there are 36 - 16 = <<36-16=20>>20 minutes of the call left.
And these 20 minutes cost 20 * 0.2 = $<<20*0.2=4>>4.
So in total, the 36-minute call would cost 4 + 4 = $8.
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