Consider the marginal cost function C'ix) = 9.09)? 4x+ EU. a. Find the additional cost incurred in dollars when production is increased from 15 units to 21} units. b. If CUE] = 233. determine C(20) using your answer in {a}. <: a. the additional cost incurred in dollars when production is increased from units to approximately not round until nal answer. then two decimal places as needed. b. crzo d>