A factory produces output (Q) using capital (K) and labor (L) according to the production function Y(K,L)=K^1/5*L^4/5 Let r denote the price per unit capital, and w denote the price per unit labor, so that the total expenditure on these factors is rK + wL.

As the factory manager, you have been told to produce 625 units of output. Give the equation for the relevant isoquant, written with L as a function of K.