The four boys save money's problem

iteye_4537

于 2009-04-30 15:30:00 发布

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这是一个关于四个男孩——Chinku、Dinku、Pinku和Tinku的故事。他们决定将钱存入一家名为“LenaBank”的银行，这家银行的特点是每个月存款都会翻倍。从第二个月开始，每个男孩依次从银行取出100卢比，直到第五个月他们的账户余额变为零。问题是，最初他们一共存入了多少金额？

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first, we can see the problem:

This is a story of four boys - Chinku, Dinku, Pinku and Tinku.

One day all of them decide to save their money in a bank. They select a
bank called "Lena Bank"

The bank's specialty is: In every month the money gets doubled.

In 2nd month, Chinku withdraws 100-Rs from bank.
In 3rd month, Dinku withdraws 100-Rs from bank.
In 4th month, Pinku withdraws 100-Rs from bank.
In 5th month, Tinku withdraws 100-Rs from bank. Then their balance in the
bank becomes zero.
How much amount had the boys put in the bank?

OK, please see the problem-solving steps:

problem-solving steps