S1 7.1 - 7.3 Percentages

What is 35% of 420?

• 1 200

• 273

• 147

• 12

What percentage of a minute are 48 seconds?

• 125%

• 80%

• 20%

• 0.8%

There are 120 balls in a bag. If 48 of them are red and the rest are blue, what percentage of the balls are blue?

• 40%

• 48%

• 60%

• 72%

The percentage increase from 220 to 297 is

• 23%.

• 35%.

• 65%.

• 77%.

The price of a smartphone decreases from $6 400 to $5 440. The percentage decrease in the price is

• 15%.

• 85%.

The length of each side of a square increases from 10 cm to 12 cm. Find the percentage increase in the area of the square.

• 44%.

• 20%.

Which of the following is the greatest?

• Increase from 80 by 20%

• Increase from 90 by 5

• Decrease from 100 by 6%

• Decrease from 110 by 15

The salary of Bella increases by 15% to $18 400. Find her original salary.

• $15 640

• $16 000

• $17 173

• $21 160

There are 180 workers in a factory. If the number of male workers is 20% less than that of female workers, then the number of male workers is

• 36.

• 72.

• 80.

• 100.

James bought two T-shirts for $120. Then, he sold them for $105 each. Find the percentage profit.

• 87.5%

• 75%

• 25%

• 12.5%