Please round part a to the nearest integer and for part b please round to a whole number

The marginal revenue (in thousands of dollars) from the sale of x handheld gaming devices is given by the following function. WIN R'(x) = 4x (x + 25,000) (a) Find the total revenue function if the revenue from 115 devices is $22,116. (b) How many devices must be sold for a revenue of at least $30,000? (a) The total revenue function is R(x) = given that the revenue from 115 devices is $22,116. (Round to the nearest integer as needed.) (b) devices must be sold to generate a revenue of at least $30,000 (Type a whole number.)