3B Mathematics (17/2)

3B Mathematics (17/2)

By Wang Kwong

Ch.7 Percentages(II)

Some text here about the topic of discussion

Ch.7 Percentages(II)

Some text here about the topic of discussion

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90 x 10% = ?

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$70\div20\%=?$  

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Find the percentage change when a value changes from 43 to 86.

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Find the percentage change when a value changes from 86 to 43.

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When 50 increases by 6%, find the new value.

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When a number increases by 16%, it becomes 87. Find the original number.

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When a number decreases by 45%, it becomes 374. Find the original number.

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A number increases by 28% and then decreases by 50%. If the resulting number is 32, find the original number.

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The original price of a ring is $27 000. If the price of the ring decreases by 9% every quarter, what will its price be two years later?

          (Give the answer correct to the nearest dollar.)

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A sum of $2000 is deposited at an interest rate of 5% p.a. for 3 years, compounded yearly. Find the amount.

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A sum of $9000 is deposited at an interest rate of 1% p.a. for 2 years, compounded yearly. Find the interest.

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Emily deposits a sum of money in a bank for 2 years and the interest rate is 4% p.a., compounded yearly. If the amount received is $70 304, find the sum of money deposited.