C = y2 +2y + 9
Average total cost ,ATC , c/y = ( y2 +2y + 9)/y
= y2/y + 2y/y + 9/y
ATC = y + 2 + 9/y
Hence, option(D) is correct.
D1. Suppose a firm in a perfectly competitive market has the cost function c(y)= y2 +...
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