New Puzzle - Xls Download

Hi,
Please Solve it
Since your brain is fresh, you can work out the following puzzle
This is a story of four boys................... Chinku, Dinku, Pinku & 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 & their balance in the bank becomes zero........ ......... ...
How much amount had the boys put in the bank?
Answer is the password of the excel sheet......................
Give your brain cells some food............
I have solved...............now it's your turn!!!!!!!!!!

Hey swati......tried it but:confused::confused::confused::confused:,.....n ot getting the answer, can u plz let us know thr answer........:(

Hey even i got It......RJ u r a born intelligent!!!!:icon6::icon6::icon6::icon6::-D:-x ( Thts ur misundrstanding) Anyways i petty on u.....:-P:-P:-P:-P:-P
Even i got he answer!!!!
दीमक की बती हुमारी हमेशा जेलती है सिरजी:idea::idea::idea:

Hi all,
jus came across ur names..
'm workin on a project on Performance appraisal methods in Outsourcing compainies...
If any of u could give me some information...
cheers! :)

hi i am solv it please find the attachmnet

This is a story of four boys........ ......... . Chinku, Dinku, Pinku & Tinku.? - Yahoo! Answers India

At IIM, I was told that IITians solved such puzzle when they were at their mother's knees.

I had encountered this, when I was in Standard VI (that is how it used to be written - in Roman numerals).

I had solved it in this manner :

Let the initial amount be x.

At the end of the first month, i.e. in the second month the money would become 2x and considering Rs. 100 withdrawal, it will be :

2x-100

In the third month the above amount will double and considering Rs. 100 withdrawal, it will be :

(2x-100)2 - 100

Similarly for the fourth month :

{(2x-100)2 - 100}2 - 100

In the fifth month, after Rs. 100 withdrawal, it becomes zero. So, the equation for money in bank will take the form :

[{(2x-100)2 - 100}2 - 100]2 - 100 =0

Solving the above,

[{(2x-100)2 - 100}2 - 100]2 = 100

or, [{4x-200 - 100}2 - 100]2 = 100

or, [8x-400 - 200 - 100]2 = 100

or, [8x-700 ]2 = 100

or, 16x-1400 = 100

or, 16x = 1500

or, x = 1500/16

or, x = 93.75

One of my class-mate, who joined IIT later, chided me for taking lengthy intervening steps, and suggested the following :

Total amount in bank at the end of 4 months (begining from the second month) would be :

(x multiplied by 2 raised to power 4) - (2 raised to power of 4 -1)100 =0

or, 16x - 1500 = 0

Solving for x you get, x= 93.75

Q.E.D.

Warm regards.