将某商品涨价25%,如果涨价后的销售金额与涨价前的销售金额相同,则销售量减少了______%.
人气:273 ℃ 时间:2020-01-31 19:14:52
解答
设原来的销量为1,减少的量为x,
根据销量×价格=销售金额的关系式得:
(1-x)×(1+25%)=1×1
125%-125%x=1,
125%x=25%,
x=0.2;
0.2÷1×100%=20%.
答:销售量减少了20%.
故答案为:20.
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