2. (9 points) A company that sells a hats has calculated that the total revenue, R(x), in dollars, from the sale of 120 hats is 1860 dollars. The company also calculates that the marginal revenue when 120 hats are sold is 12 dollars per hat. (a) Use the marginal revenue to estimate the total revenue from the sale of 121 shirts. dollars. (b) Use the marginal revenue to estimate the total revenue from the sale of 123 shirts. dollars. (c) Use the marginal revenue to estimate the total revenue from the sale of 118 shirts. dollars