Week 18 GCSE X Interest

​Simple & Compound Interest

​Aims & Objectives

* Percentage Change

* Simple Interest

* Percentage Recap

* Compound Interest

​It is useful to remember that percent comes from the words per- (meaning out of) and -cent (meaning 100).
A percentage is measured out of 100

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​Percentage Change

Multiple Choice

Original: 35

New: 70

• 100% increase

• 50% increase

• 200% decrease

• 100% decrease

Multiple Choice

Original: 80

New: 52

• 35% decrease

• 35% increase

• 28% decrease

• 28% increase

Simple Interest

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Simple Interest

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Multiple Choice

A mobile phone was £200 last year. This year, its price increased by 10%. What is the new price?

• £210

• £220

• £230

• £240

Compound Interest

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Compound Interest

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Fill in the Blank