6 An auto-repair shop faces the following weekly costs: rent, $600; labour, $500 per worker; parts and supplies, $30 per repair. Each worker can repair 3 cars per week. Instructions: Round your answers to the nearest dollar. Leave no cells blank. Enter O if there is no associated cost. a. Fill in the costs in the table below. b. If the shop repairs 15 cars in a week, the total costs are $ 3550 c. If the shop repairs 0 cars in a week, the total costs are $ 600 Quantity of repairs Variable costs ($) Total costs ($) 500 3 590 1190 6 1180 1780 9 1770 2370 12 2360 2960 15 2950 3550 18 3540 4140 21 4130 4730 24 4720 5320