A computer component manufacturer in China determines that manufacturing costs (y in Chinese Yuan (CNY) ) are determined by an equation y = 0.3x2 - 4x +12 (x = quantity manufactured in 100s) . Determine the volume of production (x) where costs are minimised (to nearest 10) .
A) 660
B) 670
C) 680
D) 690
Correct Answer:
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