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Year 9 Financial Mathematics
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Year 9 Financial Mathematics
💰 Part 1: Basic Financial Calculations
1. Round 4.567 to 2 significant figures.
2. A recipe calls for flour and sugar in the ratio 3:2. If you use 450g of flour, how much sugar do you need?
3. Sarah drives 180 kilometres in 2.5 hours. Calculate her average speed in km/h.
4. A jacket originally costs $120. It is reduced by 25%. What is the sale price?
5. A shop buys a phone for $300 and sells it for $450. Calculate the profit as a percentage of the cost price.
💼 Part 2: Income and Taxation
6. James earns $25 per hour for a 38-hour week. He also works 6 hours overtime at time-and-a-half. Calculate his total weekly pay.
7. A car salesperson earns a base salary of $40,000 per year plus 3% commission on all sales. If they sell $200,000 worth of cars in a year, what is their total annual income?
8. Using the tax table below, calculate the annual tax payable on a gross income of $65,000.
Tax Table:
$0 - $18,200: 0%
$18,201 - $45,000: 19%
$45,001 - $120,000: 32.5%
9. What is the net weekly income for someone earning $52,000 per year if their annual tax is $7,800?
📈 Part 3: Simple Interest
10. Calculate the simple interest earned on $2,500 invested at 4.5% per annum for 3 years.
11. Tom borrows $8,000 for 18 months at a simple interest rate of 6% per annum. What is the total amount he must repay?
12. An investment of $1,200 earns $180 in simple interest over 2 years. What was the annual interest rate?
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