The revenue equation

The revenue equation (in hundreds of million dollars) for my barley production is R(x)=0.0619x^2+1.2301x+2.4183 where x is hundreds of millions of bushels. What is the marginal revenue question R'(x), the marginal production of 300,000,000 bushels has a marginal revenue iof_hundred million dollars. And 450,000,000 bushels is _hundred million dollars