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Question

Salary of a school teacher increases by 25% every year. His salary in the year of 2005 was ₹20,000. What was his salary in 2003?

A
₹10,000
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B
₹12,800
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C
₹16,000
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D
₹8000
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Solution

The correct option is B ₹12,800
Assume salary of school teacher in 2003 was x.

Given, his salary increase by 25% every year.
His salary in 2004 =x+(25% of x)
x+(x×25100)=x+x4=5x4
And his salary in 2005 =5x4+(25% of 5x4)
5x4+(5x4×25100)=5x4+5x16=25x16

As given his salary in 2005 was ₹20,000.
25x16=20000x=800×16=12800

Hence, option 'b' is correct.

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