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【OG20-P286-378题】
From May 1 to May 30 in the same year, the balance in a checking account increased. What was the balance in the checking account on May 30?
(1) If, during this period of time, the increase in the balance in the checking account had been 12 percent, then the balance in the account on May 30 would have been $504.
(2) During this period of time, the increase in the balance in the checking account was 8 percent.
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条件1:期初的余额是504/1.12,但是实际增长率未知,不充分
条件2:期初余额未知,不充分
结合:504/1.12*1.08,可以求出期末余额,充分
题目讨论 (8条评论)

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568588kopd
我ri
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0 回复 2022-01-14 20:13:43
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冲他丫的
第一个是假设 不是真的
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0 回复 2021-10-17 15:26:25
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你这只猪
if 虚拟语气
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0 回复 2020-07-01 16:42:11
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emily666
我的天。。。 If。。。。
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0 回复 2020-05-11 22:00:10
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Meiii
思路奇清...
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0 回复 2020-03-06 22:07:29
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猪猪精上740
条件一是虚拟语气 不是实际发生的 给这个条件是为了算五月一号账户里的钱 再结合条件2就可以算实际卡里30号的余额了
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0 回复 2019-10-14 14:09:37
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UomoVitruviano
!
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0 回复 2018-11-17 19:53:06
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Ada
通过条件1能得出原来account里有多少钱 x*(1+12%)=504; x=504/1.12 通过条件2能得出实际增长8%之后的账户余额 504/1/12*1.08 注:条件1里写的是if,也就是假设增长12%,余额是504
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0 回复 2017-08-12 18:59:39
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730以上回复Ada
赞!
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0 回复 2018-01-23 16:02:24
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