The cost function in dollars for producing :1: items of a certain brand of barstool IS given by C(a: )2001333 0.26a: +13x+200, a) Find Mom) _ C'(a:). b) Find M C (50) and'explain what this quantity represents. 1c) Calculate the exact cost of producing the 51th barstool and compare with the result in part (b) ((1) Use C(50) and M C (50) to estimate the total " cost of producing 53 barstools