York Construction agreed to lease payments of $$762\mathrm{.}79$ on construction

equipment to be made at the end of each month for six years. Financing is

at $15\%$ p$.$a$.$ compounded monthly.

a$.$ If the lease were paid off after ten months, what would the total interest

be$?$

b$.$ How much of the total interest would be due to deferring the first nine

payments?