Interest & Depreciation

• Mathematics
• Upper Secondary (Key Stage 4)
• GCSE

Interest & Depreciation

A price decreases from $80 to $64. What is the percentage decrease?

1. 30%
2. 20%
3. 15%
4. 25%

A population decreased by 15%. What is the remaining population?

1. 85% of the original population
2. 90% of the original population
3. 70% of the original population
4. 100% of the original population

If a salary decreases by 10%, what is the amount of the decrease?

1. 20% of the original salary
2. 5% of the original salary
3. 15% of the original salary
4. 10% of the original salary

If a price increases by 20%, what is the multiplier for the increase?

1. 2.00
2. 0.80
3. 1.20
4. 1.50

The value of a car depreciates by 10%. What is the multiplier for the depreciation?

1. 0.50
2. 1.10
3. 0.75
4. 0.90

Erin puts £240 into a savings account which has 3% APR and leaves it.
How much will she have after 4 years?

Recap - Compound

Zaara puts £1400 into a savings account with 4.5% apr and leaves it.

How much will there be after 6 years?

How much interest will she have earnt after 6 years?

Recap - Compound

Zaara puts £1400 into a savings account with 4.5% apr and leaves it.

How much will there be after 10 years?

How much interest will she have earnt after 10 years?

Recap - Compound

Skye buys a brand new car for £34,000.

It depreciates at a rate of 2.7% per year.

How much is it worth after 3 years?

www.draustinmaths.com

Simple vs Compound

2.5% APR for 3years on £200

(have a go at working out the compound first)

Which should Alice choose and Why?