Hi

I am very stuck on this part of a question. The first part was easy enough, and basically I found out the following information about a farmer: The farmer has £ 15,000 to spend on renting land A, and onfertiliser F. I worked out previously that the the rent for an acre of land is £ 10 and thatFertiliser costs £ 100 per ton. If the

farmer’s yield in bushels of wheat is

W(A, F) = 400AF^0.5

by using the Lagrangean method, fi…nd the amounts of land and fertiliser which will

maximise the farmer’s yield. Verify that you have a maximum. How would you

measure the marginal increase in yield of increasing the budget, and what value

would you obtain?

Now, I know that I take the partial derivativea and set them equal to zero, but I just don't know where to start. Can anyone help me?

Thanks