Why the answer is D please explain clearly

8) A linear cost function is estimated over the relevant range of 0 to 1,000 orders. The equation estimated is: Y-$25,000+$89X where Y equals the total order-processing cost and X equals the number of orders. If the number of orders increases to 1,800, what is the predicted total order-processing cost? A) $25,000 B) $160,200 C) $185,200 D) sanuot be determined Answer. D