For a certain product, cost C and revenue R are given as follows, where x is the number of units sold in hundreds. Cost: C2 = x + 1021x +54 Revenue: 898(x-5)2 + 23R = 16,767 dC a. Find the marginal cost at x = 5. dx The marginal cost is estimated to be $ (Do not round until the final answer. Then round to the nearest hundredth as needed.)