(I) Increase 180 by 25%. (ii) Decrease 140 by 18%.

Formula of Percentage

We must divide the value by the entire value to find the percentage, and then multiply the resulting number by 100.

Percentage formula = (Value/Total value) × 100

How to find the percentage of a number?

We must apply a different formula, like the one shown below, to determine the percentage of a number.

P% of Number = X

where X = required percentage.

If the % symbol is removed, the formulas above must be expressed as;

P/100 x Number = X

Percentage increase and decrease

The original number is subtracted from the new number, divided by the original number, then multiplied by 100 to get the % increase.

% increase = [(New number – Original number)/Original number] x 100

where,

increase in number = New number – original number

Summary:-

(i) Increase 180 by 25%. (ii) Decrease 140 by 18%.

(i) By increasing 180 by 25% we get 225 and (ii) By decreasing 140 by 18% we get 114.8

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