a. Budget line is represented on the graph:
b. Opportunity cost of one ATV is 8 000/12 000 = 2/3 snowmobiles, as money we spend to buy 1 ATV can be alternatively used to buy 2/3 of snowmobile.
c. Analogously, opportunity cost of one snowmobile is 12 000/ 8 000=1.5 ATW