What is $12.25 pen set; 60% discount

My answer will be $835. First you say 12 25/1 * 60/100 That will be 1225/1 * 60/100. When reduced it will be 49/1 * 60/4. For the answer you will get 2940/4. When you divide 2940 from 4 you will get 730. But because you are finding the discount you must add $100. That will give the answer of $830.