Question

1 a. 80% of 90
1 b. 90% of 10
2 a. 60% of 50
2 b. 40% of 70
3 a. 30% of 10
3 b. 80% of 0
4 a. 30% of 30
4 b. 10% of 0
5 a. 30% of 100
5 b. 70% of 80
6 a. 50% of 40
6 b. 70% of 30
7 a. 20% of 20
7 b. 20% of 40
8 a. 80% of 20
8 b. 90% of 0

Explanation:

Step1: Recall the formula for percentage of a number

To find \( x\% \) of \( y \), we use the formula \( \frac{x}{100} \times y \).

Step2: Solve 1a: 80% of 90

Using the formula, \( \frac{80}{100} \times 90 = 0.8 \times 90 = 72 \)

Step3: Solve 1b: 90% of 10

Using the formula, \( \frac{90}{100} \times 10 = 0.9 \times 10 = 9 \)

Step4: Solve 2a: 60% of 50

Using the formula, \( \frac{60}{100} \times 50 = 0.6 \times 50 = 30 \)

Step5: Solve 2b: 40% of 70

Using the formula, \( \frac{40}{100} \times 70 = 0.4 \times 70 = 28 \)

Step6: Solve 3a: 30% of 10

Using the formula, \( \frac{30}{100} \times 10 = 0.3 \times 10 = 3 \)

Step7: Solve 3b: 80% of 0

Using the formula, \( \frac{80}{100} \times 0 = 0.8 \times 0 = 0 \)

Step8: Solve 4a: 30% of 30

Using the formula, \( \frac{30}{100} \times 30 = 0.3 \times 30 = 9 \)

Step9: Solve 4b: 10% of 0

Using the formula, \( \frac{10}{100} \times 0 = 0.1 \times 0 = 0 \)

Step10: Solve 5a: 30% of 100

Using the formula, \( \frac{30}{100} \times 100 = 0.3 \times 100 = 30 \)

Step11: Solve 5b: 70% of 80

Using the formula, \( \frac{70}{100} \times 80 = 0.7 \times 80 = 56 \)

Step12: Solve 6a: 50% of 40

Using the formula, \( \frac{50}{100} \times 40 = 0.5 \times 40 = 20 \)

Step13: Solve 6b: 70% of 30

Using the formula, \( \frac{70}{100} \times 30 = 0.7 \times 30 = 21 \)

Step14: Solve 7a: 20% of 20

Using the formula, \( \frac{20}{100} \times 20 = 0.2 \times 20 = 4 \)

Step15: Solve 7b: 20% of 40

Using the formula, \( \frac{20}{100} \times 40 = 0.2 \times 40 = 8 \)

Step16: Solve 8a: 80% of 20

Using the formula, \( \frac{80}{100} \times 20 = 0.8 \times 20 = 16 \)

Step17: Solve 8b: 90% of 0

Using the formula, \( \frac{90}{100} \times 0 = 0.9 \times 0 = 0 \)

Answer:

1a. 72
1b. 9
2a. 30
2b. 28
3a. 3
3b. 0
4a. 9
4b. 0
5a. 30
5b. 56
6a. 20
6b. 21
7a. 4
7b. 8
8a. 16
8b. 0