Do the last one

A 20-year, zero-coupon bond was recently being quoted at 19.356% 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 12.560%. The current yield on this bond is 0 %. (Round to the nearest whole percent.) The promised yield of this issue is 8.56 %. (Round to two decimal places.) Using semiannual compounding, the amount an investor would have to pay for this bond if it were priced to yield 6.28% is $. (Round to the nearest cent.)