Task: Question Answering
Input (English): Problem: it costs $ 5 for the first 1 / 3 hour to use the laundry machine at the laundromat . after the first ¼ hour it costs $ 12 per hour . if a certain customer uses the laundry machine for 2 hours and 30 minutes , how much will it cost him ?
Output (English): $ 31 .