Task: Question Answering
Input (English): Problem: a case of 12 rolls of paper towels sells for $ 9. the cost of one roll sold individually is $ 1. what is the percent w of savings per roll for the 12 - roll package over the cost of 12 rolls purchased individually ?
Options: a. 9 %, b. 11 %, c. 15 %, d. 25 %, e. 90 %
Output (English): d