A $20-$year, zero$-$coupon bond was recently being quoted at $21\mathrm{.}641\%$ of par. Find the current yield and the promised yield of this issue, given that the bond has a par value of $$1,000.$ Then, using semiannual compounding, determine how much an investor would have to pay for this bond if it were priced to yield $10\mathrm{.}950\%.$

The current yield on this bond is $\%.($Round to the nearest whole percent.$)$