A pure discount $($or zero$-$coupon$)$ government bond has a face value of $$25,000$ and a yield of $8\mathrm{.}868\%.$ If the current price of the bond is $$16,200,$ what is the maturity of the bond in years? Recall that the compounding interval for bonds is $6$ months.

$10\mathrm{.}00$

$8\mathrm{.}00$

$5\mathrm{.}00$

$20\mathrm{.}00$