A U.S. Government T-bond matures in 12 years and has a face value of $100. The bond has a coupon rate of 3.2% paid semi-annually (the next coupon is due in 6 months). The yield on the bond is 5.9%. If coupons are re-invested at 4.2% per annum, then how much interest is earned on re-invested coupons over the life of the bond? Calculate the interest as a percentage of the total cash flows received at maturity by the bondholder. Express your answer in percentage form rounded to the nearest percerit (i.e. no decimals).