The revenue equation (in hundreds of millions of dollars] {or barley production in a certain country is approximated by R[X}= [1.1161'Bx2 + 1.1561): + 2.2994 where x is in hundreds of millions of bushels. Find the marginal-revenue equation and use it to nd the marginal revenue for The produdion of the given number of bushels. [a] The marginalrevenue equaen is R'Or] = (Round to four decimal places as needed.)