Growth and decay (AQA GCSE Maths): Flashcards

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Growth and decay
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Growth definition

When a quantity increases by same % repeatedly

Decay definition

When a quantity decreases by same % repeatedly

Compound interest

Interest on original amount + previous interest

Growth multiplier formula

1+(percentage÷100)1 + (\text{percentage} \div 100)

Decay multiplier formula

1(percentage÷100)1 - (\text{percentage} \div 100)

General growth/decay formula

starting amount×(multiplier)n\text{starting amount} \times (\text{multiplier})^n

Growth multiplier range

Greater than 1

Decay multiplier range

Less than 1

Meaning of per annum

Per year

Multiplier for 20% increase

1.201.20

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