1.  Income of Suman is first increased by 7% and then it is decreased by 7%. What is the change in her income?
A. 0.49% (increase)
B. 0.39% (decrease)
C. 0.39% (increase)
D. 0.49% (decrease)
E. None of the above

Answer: Option D

Explanation:

In such case, there is always decrease.

Given that, a = (common increase or decrease) = 7%

According to the formula,

Decreased percentage = (a)2 / 100%

= (7)2 / 100 % = 0.49%