Jane has utility function u(x,y)=x4y5. The price of x is px, the price of y is py, and Jane’s income is W. What is the expression of her consumption of y as a function of prices and income (her optimal consumption is determined by the tangency rule)? Qy(px,py,W)= 9W/5py. Qy(px,py,W)= 5W/9py. Qy(px,py,W)= 4W/3py. Qy(px,py,W)= 5W/4py. Qy(px,py,W)= 4W/5py.

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