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(a) Average cost A = C/x = 0.000002x^2+5+456/x
(b) dA/dx = 0.000002*2x-456/x^2 = 0
x = (456/0.000002*2)^(1/3) = 484.88, say, 485
(c)0.000002x^2+5+456/x = 0.000002*3x^2+5
Solving it, we get x = 484.88, say 485
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