\text { Consider the marginal cost function } \mathrm{C}^{\prime}(x)=300+12 x-0.01 x^{2} \text {. } a. Find the additional cost incurred in dollars when production is increased from 150 units to 200 units. b. Find the additional cost incurred in dollars when production is increased from 400 units to 450 units. a. The additional cost incurred in dollars when production is increased from 150 units to 200 units is approximately b. The additional cost incurred in dollars when production is increased from 400 units to 450 units is approximately