The revenue equations (in hundreds of millions of dollars) for barley production is a certain country is approximated by R(x)=0.0719x^2+1.1958x+2.4797 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.

a) The marginal revenue equation is R(x)=? (round to 4 decimal places as needed)

b)find the marginal revenue for the production of 100,000,000 bushels in hundreds of millions of dollars (round to 2 decimal places)

c)find the marginal revenue for the production of 650,000,000 bushels in hundreds of millions of dollars (round to 2 decimal places)