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

Let's start by using the information that 20% of a is equal to 80% of b. We can write this as an equation:

0.20a = 0.80b

To simplify, divide both sides by 0.20:

a = 4b

Now, we want to find a + b. We can substitute the expression for a in terms of b:

a + b = 4b + b

Combine like terms:

a + b = 5b

Now, we can express this in terms of a by substituting a = 4b:

a + b = 5(1/4)a

a + b = 1.25a

So, the correct answer is: 1.25a

Explanation

(16 ÷ 80) × 100 = 20%

It shows that 16 is 20% of 80.

Explanation

x + 25% of x = 250

x × (1 + 0.25) = 250

x × 1.25 = 250

x = 250 / 1.25 = 200

Last verified on 06-10-2026

Explanation

15% of 240 = (15/100) × 240

= 0.15 × 240 = 36

Last updated by NA on 24-April-2026