K An outboard motor has an initial price of $3,240. A service contract costs $300 for the first year and increases $130 per year thereafter. The total cost of the outboard motor (in dollars) after n years is given by C(n) = 3,240 + 240n+40n2, where n ≥ 1. Complete parts (A) through (C). (A) Write an expression for the average cost per year, C(n), for n years. C(n)= (B) Graph the average cost function found in part (A). Choose the correct graph below. O A. 4,500 B. y 4,500- 4,500- 20 20 D. C. Q 4,500- 0- 20 0 20 (B) Graph the average cost function found in part (A). Choose the correct graph below. OA. Ay 4,500 20 OB. ○ C. O D. Q Q 4,500- Ay Q 4,500- 4,500- 20 20 (C) When is the average cost per year minimum? (This time is frequently referred to as the replacement time for this piece of equipment.) The average cost per year is minimum after years. 20 n