on excel step by step please.

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 $$6\mathrm{.}80$ and would be depreciated straight$-$line to zero over four years. Because of radiation contamination, it will actually be completely valueless in four years. You can lease it for $$1645646$ per year for four years.

Assume that the tax rate is $23\%.$ You can borrow at $10\mathrm{.}57\%$ before taxes. What would be the maximum payment that a leasee is willing to pay?

NOTE: Enter the number rounding to four DECIMALS. If your decimal answer is $0\mathrm{.}034576,$ your answer must be $0\mathrm{.}0346.$ DO NOT USE the $\%$ sign