The marginal revenue {in thousands of dollars} from the sale of 3r gadgets is given by the following function. R'{X}=4x [x2 wanna) 3 a. Find the total revenue function if the revenue from 125 gadgets is $41.21? b. How many gadgets must he sold for a revenue of at least $40,000? a. The total revenue function is Fthr} = D, given that the revenue from 125 gadgets is $41,211 [Round to the nearest integer as needed} h. D gadgets must he sold to generate a revenue of at least $40,000 {Type a whole number.)