Percentages Equations Math IGCSE

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7 Terms

1
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To find the percentage of the quantity, you would press the percentage amount and then shift to (%) and then multiply by __________.

The quantity

2
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In the formula for percentage increase or decrease, the New Value is calculated using…

New value = original value x (1+ P/100)

3
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To find the original price use the equation…

Original price= New Value/ 1+ P/100

4
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Reverse percentage is to find the original value so the equation is, original value =

New value/ 1+ (or - for decrease) P/100

5
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The formula for Percentage change is Percentage change =

New value - original value / original value x 100

6
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The formula for Simple Interest (SI) is =

P x R x T (initial amount x interest per yr x time) / 100

7
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The formula of Compound interest change is, final value = initial value x

(1 + P/100)^n P= percentage change n= no.of periods