求助啊啊

anwear

This year Henry will save a certain amount of his income, and he will spend the rest. Next year Henry will have no income, but for each dollar that he saves this year, he will have 1 + r dollars available to spend. In terms of r, what fraction of his income should Henry save this year so that next year the amount he has available to spend will be equal to half the amount that he spends this year?
各位大神是怎么解的  说给小虾听听

SOcode

首先说明我也是菜鸟G友哈，题目我碰到过，意思是HENRY今年赚了一笔钱，他要存一部分，然后把剩下的花掉，明年HENRY没有收入，但是他今年存的钱明年可以花，就是说今年存X刀，明年就能花X（1+r）刀，就是有一个年利率的意思，然后问题是他今年应该存多少钱，以便于明年能花的钱等于今年花的钱的一半

应该是这样的吧，呵呵，如果有错误希望楼下的朋友们指出来哈