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An economy is employing 2 units of capital, 5 units of raw materials, and 8 units of labor to produce its total output of 640 units. Each unit of capital costs $10; each unit of raw materials, $4; and each unit of labor, $3.

If the per unit price of raw materials rises from $4 to $8 and all else remains constant, the per unit cost of production will rise by about:

A) 50 percent.
B) 30 percent.
C) 40 percent.
D) 100 percent.