A firm plans to either purchase or lease a machine that costs $$300,000$ and is subject to a $20-$percent CCA rate, using the declining balance method. The required lease payments are $$35,000$ at the beginning of each of four years. The lessor has agreed to provide maintenance as part of the lease contract, and the firm has estimated it would incur $$25,000$ per year in maintenance expense if it decided to purchase the machine. It estimates the asset could be sold for $$138,240$ after four years $($the ending UCC at the end of year $4).$ The firm$$s before$-$tax borrowing rate is $9$ percent, and its effective tax rate is $40$ percent. Should it purchase or lease the machine, assuming the acquisition of the machine has a positive NPV$?($Include the half$-$year rule.$)$