Question

请高手帮忙解一道英文数学题

Two shops sell the same brand of chocolate at the same price . Today they both cut down its price. Shops A decreases the price by 30%, and increases by 30% after a week. Likewise, shop B decreases its price by 40%, and decreasesby 40% after a week. Are the prices of the chocolate at the two shops still the same after a week?

Answer 1

不一样，假设开始时价格为P，对于商店A，一周之后为P×0.7×（1+0.3），而对于商店B，一周之后为P×0.6×﹙1+0.4﹚

Answer 2

假如两个原价都为100元，那么A：100（1-30%）=70 70*（1+30%）=91
B：100*（1-40%）=60 60*（1+40%）=84 所以不相等