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Press Ctrl-APress Ctrl-A©G Dear 2010 – Not to be sold/Free to use
Fixed InterestFixed InterestStage 6 - Year 12Stage 6 - Year 12
General Mathematic
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SI = P r n
also known as Simple Interest.
Click on the letters for their meaning.
Simple
InterestPrincipal
Money
`umber ofPeriods
Rate of Interestper period
It is calculated as a percentage of money borrowed.
You must repay the principal and the interest.
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Mary borrowed $5000 for 4 years at 7% p.a.to buy some sheep.
SI = P r n= 5000 x 7
100x 4
= $1400
How much does she have to repay?
Repay = $5000+ $1400
= $6400
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A chef need $20 000 at 9% p.a for 4 years to refurbishhis restaurant. He has a 10% deposit.
i) How much was the deposit?
Deposit = 10100
x 20 000 = $2000
ii) What is the balance borrowed?
Balance = 20 000 - 2 000 = $18 000
iii) How much is the interest?
Interest = 18 000 x 9100
x 4 = $6 480
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A chef need $20 000 at 9% p.a for 4 years to refurbishhis restaurant. He has a 10% deposit.
i) How much does he repay?
Repay = 18 000Borrowed
+ 6480 Interest
= $24 480
ii) What is the monthly repayment?
Monthly Repay = 24 480Repay
÷ 4 Years
÷ 12 Months
= $510 per month
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Jane borrowed $70 000 to open her detective agency.
She repaid it at $933.33 per month for 10 years.
What was her flat interest rate?
Total Repayments = $933.33x 12 monthsx 10 years
= $ 112 000
Total Interest = $112 000- $70 000= $42 000
Annual Interest = $42 000÷ 10= $4 200
Interest % = 4 20070 000
x 100%= 6% p.a.