Mary owes John $$10,000$ at an interest rate of $5\%$ payable over three years with her jute as collateral. John and she agree to replace the collateral with a mortgage on her home, which mortgage is unmarketable. What result to John, in general terms? See Reg. $1\mathrm{.}1001-3($a$)(1).$ It may not be in your book of Codes and Regulations, so it is reproduced below. $[1]$ Assume, based on the foregoing footnote, that the change is a significant modification of the debt.