SAT1数学题Dan needs to gain 8% of his current body weight to wr

SAT1数学题
Dan needs to gain 8% of his current body weight to wrestle in weight Class A.Dan needs to lose the same percent of his current weight to wrestle in weight Class B.What percent of Dan's Class A weight,to nearest tenth,does he need to lose to get to his Class B weight?
McGraw-Hill的新SAT官方指南详解 CHAPTER 5 / PERCENTS里的第19题 没看懂.