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 =x2 + 98vx + 54 Revenue: 892(x - 6) + 28R2= 25,200 dc SS a. Find the marginal cost - at x = 6. rary The marginal cost is estimated to be $ (Do not round until the final answer. Then round to the nearest hundredth as needed.) ons dR b. Find the marginal revenue at x = 6. dx The marginal revenue is estimated to be $ (Do not round until the final answer. Then round to the nearest hundredth as needed.)