Ana borrowed $$22,500$ at $4\mathrm{.}00\%$ p$.$a$.$ from her parents to start a business. In $2$ months, she repaid $$2,500$ towards the loan, and in $10$ months she repaid $$7,600.$ How much would she have to repay her parents at the end of $14$ months to clear the outstanding balance? Use the declining balance method to calculate the last payment.