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The table above shows the percent of change from the previous month in Company X's sales for February through June of last year. A positive percent indicates that Company X's sales for that month increased from the sales for the previous month, and a negative percent indicates that Company X's sales for that month decreased from the sales for the previous month. For which month were the sales closest to the sales in January?
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设Jan的销售额为x，则Feb=1.1x; March=1.1*0.85x=0.935x; April=0.935*1.2x=1.122x; May=1.122*0.9x=1.0098x; June=1.0098*1.05x=1.06029x; 综上May最接近
196309fxht
设一月为100 二月110 三月93.5 四月112.5 五月100.98 六月106.029
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2022-02-10 16:49:41
400473wdoj
结果是死算。我想了半天技巧…这题有啥意义…
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2021-07-11 01:17:06
418881sucu
老外推荐的稍微简单的方法 When the percentage changes are numbers such as 10, 15, 20 etc, it is easier to use the formula: Total change = a + b + ab/100 March total change = 10 - 15 -10*15/100 = -6.5 April total change = -6.5 + 20 -6.5*20/100 = 12 (approx) May total change = -8 + 12 -8*12/100 = 3 (approx) Next change is increase of 5% so it will increase the total change. Hence May has the smallest overall change from Jan of about 3%.
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2020-09-13 23:58:37
174786yi回复418881sucu
请问May的-8从哪里来的呀？不应该是-10？
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2020-10-03 10:49:20
eveyyy回复418881sucu
太妙啦 感谢！！
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2021-03-07 00:26:27
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