Use the table to answer the following question:

Nitrogen applied

(lbs)

Yield (bushels)

Marginal revenue

Marginal

cost

0

80

--

--

25

114

$4.00

$0.29

50

138

4.00

0.42

75

155

4.00

0.59

100

166

4.00

0.91

125

172

4.00

1.67

150

176

4.00

2.50

175

178

4.00

5.00

200

179

4.00

10.00

Assume nitrogen costs $0.40 per pound, corn price is $4.00 per bushel and all other costs total $600 per acre. At the profit maximizing amount of output, what is profit per acre?

a.$44/acre

b.$60/acre

c.$644/acre

d.$704/acre