SSC CGL 2022 PYQ — Question 75

5The correct answer is Option 1 i.e. 4%.

Given:

Increment = 20%

Decrement = 20% of the new number

Concept Used:

Net Decrease = ${(Final\ number - original\ number)\over original\ number} \times 100$

Explanation:

Let the original number be 100.

Now, after first increment, new number = 100 + 20% of 100

⇒ New number = 100 + 20 = 120

Now, after decrease in new number, final number = 120 - 20% of 120

⇒ Final number = 120 - 24 = 96

Now, net decrease = ${(100 - 96) \over 100} \times 100$ = 4%

Hence the net pecentage decrease is 4%.