Explanation

Given:

Increment in number = 20% of the number

Decrement in number = 20% of the new number

Concept used:

Net increase or decrease percent = {(Original number or Final number) - (Final number or original number) ÷ Original number} × 100

Calculation:

Let the original number be 100

When the number is increased by 20%

New Number = 100 + 20% of 100

⇒ 100 + 20

⇒ 120

Now, the number is decreased by 20%

Final number = New number – 20% of new number

⇒ 120 – 20% of 120

⇒ 120 – 24

⇒ 96

∴ Net Decrease in percentage = { (100 – 96) / 100} × 100

⇒ {4/100} × 100

⇒ 4%

∴ The net decrease percentage is 4%.

Last verified on 11-07-2026

Explanation

15% of 2000 = (15 ÷ 100) × 2000 = 300

Last verified on 10-07-2026

Explanation

Explanation

Area = length x width

One side increased 20% means new side = 1.2 x old side

To keep area same, other side must be 1 / 1.2 = 0.8333 of old side

0.8333 = 83.33%

Decrease = 100% - 83.33% = 16.67%

Last verified on 17-06-2026

Explanation

20% of 200 = (20 ÷ 100) × 200

= 0.2 × 200

= 40

Last verified on 16-06-2026