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An outboard motor has an initial price of ​$1,920. A service contract costs ​$350 for the...

An outboard motor has an initial price of ​$1,920. A service contract costs ​$350 for the first year and increases ​$100 per year thereafter. The total cost of the outboard motor​ (in dollars) after n years is given by ​C(n)=1,920+180n+30n^2​, where n>1. Complete parts A through C

(A) Write an expression for the average cost per year, C(n), for n years

(B) Graph the average cost function found in part (A)

(C) When is the average cost per year minimum? The average cost per year is minimum after__ years

Math   Calculus   
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