Borrowed:$886059,$ interest rate $5\mathrm{.}9\%.$What is the fortnightly payment from year $11$ if the interest rate increased by $1\mathrm{.}5\%$ in the $5$th year and $0\mathrm{.}60\%$ from year $11?$ Fortnighly payments $(26/$year$)$ and to be paid off in $25$ years