The marginal revenue (in thousands of dollars) from the sale of x gadgets is given by the following function. R(x)=4x(x2+29,000)32 a. Find the total revenue function if the revenue from 115 gadgets is $18.933. b. How many gadgets must be sold for a revenue of at least $50,000 ? a. The total revenue function is R(x)=6(x2+29000)31170, given that the revenue from 115 gadgets is $18,933. (Round to the nearest integer as needed.) b. gadgets must be sold to generate a revenue of at least $50,000 (Type a whole number)