When Farmer Hoglund applies N pounds of fertilizer per acre， the marginal product of fertilizer is 1-（N=200） bushels of corn.If the price of corn is $1 per bushel and the price of fertilizer is $0.40 per pound， then how many pounds of fertilizer per acre

When Farmer Hoglund applies N pounds of fertilizer per acre， the marginal product of fertilizer is 1-（N=200） bushels of corn.If the price of corn is $1 per bushel and the price of fertilizer is $0.40 per pound， then how many pounds of fertilizer per acre should Farmer Hoglund use in order to maximize his profits？
A.120
B.240
C.64
D.248
正确答案：120