Topic 7 Percentages With Answer Key - Math Quest 7 Page 20
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40number and algebra
William earns $570 per week. He has just received a pay rise of 3%.
13
How much more will William earn per week?
a
How much in total does William earn after his pay rise?
b
The Tattslotto jackpot for Saturday night is $20 million. If you win 8% of the jackpot,
14
how much money will you win?
The Australian cricket team was fi ned 15% of their match payments for a slow over
15
rate. If the team was paid $80 000 for the match, how much was the team fi ned?
Australia has 315 species of mammals. Of these,
16
15% are threatened. How many threatened species
of mammals does Australia have? (Round your
answer to the nearest whole number.)
Two million people attended at least one game of
17
Australian Rules Football last year. Of these people,
30% attended 10 games or more. How many people
attended 10 or more games of Australian Rules
Football?
The water content of a particular brand of shampoo
18
is 35%. After performing a calculation Peter claims
that an 800 mL bottle of this particular shampoo
contains 28 mL of water.
Why is Peter’s calculation incorrect?
a
How much of the shampoo in the 800 mL bottle
b
is actually water?
In Perth, 36% of adults use a telephone to pay bills
19
and 2% use the internet. If 50 adults need to pay
bills, how many will use the:
telephone
a
internet?
b
In Weburbia, 24% of all households have access to the internet. If
20
there are 34 houses in Website Street, how many would you expect
to have access to the internet? Write the answer to the nearest whole
number.
Terry runs a factory that makes parts for trucks. He has increased
21
his staff by 12%. If Terry had 34 workers, how many workers
does he have in the factory after the increase? Write the answer
to the nearest whole number.
In the year 2010, 60% of households in Geelong had a smoke
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alarm; 94% of these worked. A street in Geelong has 20 houses.
How many houses would you expect to have a smoke alarm?
a
How many would have a smoke alarm that works? Write the
b
answer to the nearest whole number.
reaSOnIng
During pregnancy or childbirth 6.25% of African women die. Of
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30 African women who are pregnant, how many are likely to die
during pregnancy or childbirth? Because the answer is people, write
it to the nearest whole number. Justify your answer.
Topic 7 • Percentages
263
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