On august 1 ,2009 a supplier increased the price of product by 25%. on august 15 , 2009 he decrease the price by 16%.if the price of product on august 15,2009 is rs 63.what was the price of july 31 2009

The answer is Rs 60

Explanation:

Lets suppose the price of July 31 2009 as "X"

At the first change

"X" was increased by 25%

Which means X * (1+25%)= 1.25X

Then in the second change the price was decreased by 16%

Which means 1.25X * (1-16%)= 1.25X * 0.84

Lets complete the equation as we know the price after second change which is Rs 63

63= 1.25X * 0.84

1. 63/0.84 = 1.25X

2. 75/1.25 = X

3. 60 = X

4. Hence the price at July 31 2009 was Rs 60

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