please help asap!! this is wrong

thank you

You work for a nuclear research laboratory that is contemplating leasing a diagnostic scanner (leasing is a common practice with expensive, high-tech equipment). The scanner costs $6,400,000, Because of radiation contamination, it will actually be completely valueless in four years. You can lease it for $1,750,000 per year for four years. Assume that the tax rate is 21 percent. You can borrow at 6 percent before taxes. Assume that the scanner will be depreciated as three-year property under the MACRS depreciation. What is the NAL of the lease? (A negative answer should be indicated by a minus sign. Do not round intermediate calculations and round your answer to 2 decimal places, e.g., 32.16.)