A cow will produce 8500 lbs. of milk if fed either 5000 lbs. of hay and 6200 lbs. of grain or 5600 lbs. of hay and 5400 lbs. of grain. Over this range, the marginal rate of technical substitution between hay and grain is
A. 0.75.
B. 0.17.
C. 0.98.
D. 6.00.
E. 1.02.
Answer: A
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