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S1 數學百份率問題(英文)

發問:

In 2008,the population of a country was 2.58 million which has increased by 7又2分之1% as compared to 10 years ago a)Find the population in 1998 year 加解釋

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最佳解答:

The population in 1998 year =2.58/(1+7.5%) =2.58/107.5% =2.4(million people) 解釋:在1998年的時候有2.4million people,之後增加了7.5%(7又2分之1%),所以=2.58million people

其他解答:

Let P be the population in year 1998 P x (1+7.5%) = 2.58 million P = 2.4 million
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