\fFind the cost function for the marginal cost function. C'(XX) = 0.06 e 0.05x . fixed cost is $5 C(X) ='1 Afence must be built to enclose a rectangular area of 45,000 112. Fencing material costs $3 per foot for the Mo sides facing north and south and $6 per foot for the other two sides. Find the cost of the least expensive fenoe. 51 The cost of the least expensive fence is $D. 2 (Simplify,r your answer.)