2022.12_P6 Coaching_Percentage increase and decrease

40% of the 25 students in a class have black hair. How many students is this?

• 10

• 15

• 20

• 5

16 out of the 28 biscuits in a packet have cream centres. What percentage of the packet are cream-centred biscuits?

• 57%

• 58%

• 100%

• 30%

• 50%

• 20%

• 25%

• 76%

12% of $90

• $12

• $78

• $10.80

• $102

Increase $90 by 12%

• $10.80

• $102

• $100.80

• $90.12

The original price of a book is $87.50. It advertised as 20% off. How much do I need to pay for it?

• $17.50

• $105

• $70

• $77.50

Decrease 500 by 30%

• 470

• 350

• 499.70

• 150

The usual price of a TV set was $500. During the Christmas holiday, the price of a TV set was decreased by 15%. If I pay $1000 for buying 2 sets, how much is the change?

• $425

• $925

• $150

• $75

The number of people signed up for a bus trip was 320 and increased by 45% one week later. What is the latest number of people signed up?

• 175

• 464

• 144

• 176

If an object is bought for $90 and then sold for a loss of 15%. How much was it sold for?

• $103.50
• $80
• 75
• $76.50