A$$ zero$-$coupon bond is a bond that is sold now at a discount and will pay its face value at the time when it$$ matures; no interest payments are made. How much should a $$$$20000$ face value$$ zero$-$coupon bond, maturing in $13$ years, be sold for now if its rate of return is to be $7\mathrm{.}9\%$ compounded $?$