8GM Percentages, Rates and Ratio Quiz

0.7 expressed as a percentage is

• 0.007%

• 0.7%

• 7%

• 70%

Answer explanation

0.7 x 100 = 70%

18% of a number is 27. What is the number?

• 150

• 200

• 250

• 300

Answer explanation

18% of a number is 27
2% of a number is 3
100% of a number is 150

• 0.42

• 0.45

• 0.042

• 0.045

0.3% equals

Increase $6000 by 30%

• $1800

• $4200

• $6200

• $7800

Answer explanation

$6000 x (100% + 30%)
= 6000 x 130%
= 6000 x 1.3
= 600 x 13
= 7800

Decrease 90 by 20%

• 70

• 18

• 108

• 72

Answer explanation

90 x (100% - 20%)
= 90 x 80%
= 90 x 0.8
= 9 x 8
= 72

If 120 is 20% of a number, what is the number?

• 24

• 96

• 480

• 600

Answer explanation

20% of a number is 120
100% of a number is 600

James bought a computer for $1400 and 2 months later sold it for $900. Did he make a profit or loss and how much?

• Profit, $500

• Profit, $400

• Loss, $500

• Loss, $400

Answer explanation

Spent $1400 but sold for $900, so he didn't make money i.e., loss and he lost 1400 - 900 = $500

Write the ratio 12 : 30 in its simplest form

• 2 : 5

• 5 : 2

• 4 : 10

• 10 : 4

Answer explanation

Divide both sides by 6

Find 40% of 120 km.

• 3 km

• 4.8 km

• 30 km

• 48 km

Answer explanation

40% x 120
= 0.4 x 120
= 4 x 12
= 48