An asset costs $640,000 and will be depreciated in a straight-line manner over its four-year life. It will have no salvage value. The lessor can borrow at 6 percent and the lessee can borrow at 6 percent. If the lessor is in the 20 percent tax bracket and the lessee pays no taxes. For what range of lease payments does the lease have a positive NPV for both parties?

a. Between $179,650 and $184,561

b. Between $179,650 and $184,699

c. The range does not exist

d. Between $184,561 and $184,699