The cost of a pair of socks is rupees x. The cost of a school bag is rupees 30 more than twice the cost of a pair of socks. Find the total cost of pair of socks and school bag.

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solution 

C(x)=0.007x3−0.003x2+15x+4000
dxdc(x)​=0.021x2−0.006x+15
=0.021×172−0.006×17+15=20.967
∴ Marginal cost =20.967

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