The marginal revenue is equal to the market prevailing price). The prevailing market price of lawn mowing is $20 per acre.

The marginal revenue is equal to the market prevailing price). The prevailing market price of lawn mowing is $20 per acre. Although John can use the family mower for free, he has other costs given by: T C = 0.1Q2 + 10Q + 50 (1) where Q is the number of acres John chooses to mow in a week. (a) How many acres should John choose to mow in order to maximize prot?