You are given the following information about a firm's investment decision. Calculate its user cost of capital (equivalently rental cost of capital). (Round to the nearest dollar)
Price of firm's output: P = $100
(Annual) Marginal production of capital (K): MPK = 400 - 2*K
Price of capital: PK = $2000
(Annual) Real interest rate: r = 0.04
(Annual) depreciation rate of capital: d = 0.1