The revenue equation (in hundreds of millions of dollars) for barley production in a certain country is approximated by Upper R(x)=0.0691x^2 + 1.2894x + 2.3391 where x is in hundreds of millions of bushels. Find the marginal-revenue equation and use it to find the marginal revenue for the production of the given number of bushels.
Find the marginal revenue for the production of 100,000,000 bushels.
Find the marginal revenue for the production of 450,000,000 bushels.