You work for a nuclear research laboratory that is contemplating leasing a diagnostic scanner $($leasing is a very common practice with expensive, high$-$tech equipment$).$ The scanner costs $$5,700,000.$ Because of radiation contamination, it actually will be completely valueless in four years. You can lease it for $$1,665,000$ per year for four years. Assume that the tax rate is $24$ percent. You can borrow at $7$ percent before taxes. Assume that the scanner will be depreciated as three$-$year property under MACRS. Use Table $10\mathrm{.}7.$

a$.$ What is the NAL of the lease?

b$.$ Should you lease or buy?