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Number and Algebra

Quick questions on Percentage and financial arithmetic explained: O-Level E-Maths

5short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.

What is percentage of a quantity?
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A percentage is a fraction out of 100100. To find a percentage of an amount, convert to a decimal and multiply: 15%15\% of 240=0.15×240=36240 = 0.15 \times 240 = 36.
What are reverse percentages?
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When you are given the amount after a change and must find the original, divide by the multiplier rather than applying the percentage to the new figure. If a price after a 30%30\% increase is 260260 dollars, the original is 2601.30=200\dfrac{260}{1.30} = 200 dollars.
What is q1?
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Increase 250250 dollars by 12%12\%. [1 mark]
What is q2?
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A price after a 20%20\% discount is 9696 dollars. Find the original price. [2 marks]
What is q3?
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Find the simple interest on 15001500 dollars at 4%4\% per year for 33 years. [2 marks]

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