Your firm is considering leasing a new computer. The lease lasts for 4 years. The lease calls for 5 payments of $450 per year with the first payment occurring immediately. The computer would cost $5,900 to buy and would be depreciated using the straight-line method to zero salvage over 4 years. The firm can borrow at a rate of 7%. The corporate tax rate is 21%. What is the NPV of the lease?