1.  If income of Vandana is 25% more than that of Aarti, then income of Aarti is how much percent less than that of Vandana?
A. 18%
B. 21%
C. 20%
D. 24%
E. None of the above

Answer: Option C

Explanation:

Let Aarti's income be ₹ 100.

 Vandana's income = ₹ 125

 Aarti's income is ₹ 25 less than 125.


Reduction in consumption

   = 125 - 100 x 100 %
125

   = 25 x 100 %  = 20%.
125


Fast Track Method:

Here, a = 25%

According to the formula,

Reduction in consumption

   = a x 100 %
100 + a

   = 25 x 100 %  = 20%.
125