1. Roberto quit his job as an economics professor to become a ski instructor. He gave up his $60,000 salary and invested his retirement fund of $50,000. He bought skis which he will not have to buy again. He runs advertising ads which always costs him the same amount each year which is $2000. He buys lift tickets as needed. This year he paid $5000 for lift tickets. Roberto gave 100 all day lessons at $200 each. His accounting_profits were: a. $20,000. b. $13,000. C. -$37,000 d. -$47,000