Western Power has an outstanding bond with a face value of 20000 and matures in 20 years. The bond makes no payments for the first 6 years, then pays 756 every six months over the subsequent 8 years, and finally pays 1221 every six months over the last 6 years. If the required return on both these bonds is 7.02 per cent compounded semiannually, what is the current bond price? [ Please do not enter the dollar symbol ($) ]