if the value of a piece of property decreases by 10 percent while the tax rate on the property increases by 10 percent, which is the effect on the taxes? 答案是 taxes decrease by 1 percent 谢谢啦 这是陈向东那本GRE数学快速突破p251 104题 拜托大家啦
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假设property为100， 100降低10%，为90，while又升高10%，90的10%是9，因此，taxes还是降低了1/100=0.01,即为1%。
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假设原来的property为x,原来的tax rate为y，原来的taxes为xy，现在的property为0.9x,现在的tax rate为1.1y,现在的taxes为0.9x*1.1y=0.99xy，现在的减去原来的再除以原来的，就是影响了吧(0.99xy-xy)/xy=-0.01=-1%,哦，就是decrease by 1percent
