The revenue equation(in hundrds of millions ofdollars) for barley production in a certain country is approximated by R(x) =0.0622x^2 + 1.1223x + 2.1094

where x is in hundreds of millions of bushels. Find themarginal-revenue equation and use it to find the marginal revenue for the production of the given number of bushels.

(a) Themarginal-revenue equation is Upper R'(x)=

(b) Find the marginal revenue for the production of 300,000,000 bushels.

The marginal revenue is ? hundred million dollars.

(c) Find the marginal revenue for the production of 850,000,000 bushels.

The marginal revenue is ? hundred million dollars.