Please solve

For the price function P(X) = 10 V 3X where p is in dollars and X is the number sold in hundreds (0 s X s 30), use R(12) and MR(12) to approximate the revenue when 1290 items are sold. [Hintz Revenue is price times quantity.] $- Interpret the marginal revenue value. At this level of sales, the revenue increases 0 by about 3; C] per additional hundred items. How much will the price need to be changed to have this level of sales? (Round your answer to two decimal places.) The price will need to be lowered c by about $ C]