Answer the Question on the Basis of the Following Information

Multiple Choice

Answer the question on the basis of the following information.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. Refer to the information.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) 100 percent.
B) 50 percent.
C) 40 percent.
D) 30 percent.