Question: Farmers can get $2 per bushel for their potatoes on July first, and after that, the price drops by 2 cents per bushel per day. On July first, a farmer has 80 bushels of potatoes in the field and estimates that the crop is increasing at the rate of 1 bushel per day. When should the farmer harvest the potatoes to maximize revenue? Let x= the number of days following July first when the farmer should harvest. Show work, put answers in spaces provided.

Target function f(x):_____
Domain of f(x):______
Domain of f(x)__________
Exact value of 2nd derivative at critical value of x:______
Max. or Min. value of f(x)_________