Explanation

After a 20% increase, the new value = 120% of the original.

Original number = 180 ÷ 1.20 = 150

Verified & Updated

Explanation

Population after 1 year = 20,000 × 1.10 = 22,000

Population after 2 years = 22,000 × 1.10 = 24,200

Last verified on 12-07-2026

Explanation

Boys = 40% of 60 = 24

Absent boys = 25% of 24 = 6

Present boys = 24 − 6 = 18

Last verified on 12-07-2026

Explanation

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