Problem Set: Percent Problems
Below, I will solve each problem step by step and explain the solution.
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1. What is 10% of 30?
To find 10% of 30:
- Convert 10% to a decimal: \( 10\% = 0.10 \).
- Multiply 30 by 0.10:
\[
30 \times 0.10 = 3
\]
Answer: \( \boxed{3} \)
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2. In a school of 80 students, 20% are boys. How many are boys?
To find 20% of 80:
- Convert 20% to a decimal: \( 20\% = 0.20 \).
- Multiply 80 by 0.20:
\[
80 \times 0.20 = 16
\]
Answer: \( \boxed{16} \)
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3. Allan bought a bicycle that cost $20.00 when it was new. If he eventually sold it for 20% of the original cost, how much was it sold for?
To find 20% of $20.00:
- Convert 20% to a decimal: \( 20\% = 0.20 \).
- Multiply $20.00 by 0.20:
\[
20.00 \times 0.20 = 4.00
\]
Answer: \( \boxed{4.00} \)
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4. Brock earned $85.00 for a week's work. If he paid 20% of it in taxes, how much did he pay in taxes?
To find 20% of $85.00:
- Convert 20% to a decimal: \( 20\% = 0.20 \).
- Multiply $85.00 by 0.20:
\[
85.00 \times 0.20 = 17.00
\]
Answer: \( \boxed{17.00} \)
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5. In a school of 100 students, 11% are boys. How many are boys?
To find 11% of 100:
- Convert 11% to a decimal: \( 11\% = 0.11 \).
- Multiply 100 by 0.11:
\[
100 \times 0.11 = 11
\]
Answer: \( \boxed{11} \)
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6. What is 16% of 25?
To find 16% of 25:
- Convert 16% to a decimal: \( 16\% = 0.16 \).
- Multiply 25 by 0.16:
\[
25 \times 0.16 = 4
\]
Answer: \( \boxed{4} \)
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7. Kabir earned $100.00 for a week's work. If he paid 10% of it in taxes, how much did he pay in taxes?
To find 10% of $100.00:
- Convert 10% to a decimal: \( 10\% = 0.10 \).
- Multiply $100.00 by 0.10:
\[
100.00 \times 0.10 = 10.00
\]
Answer: \( \boxed{10.00} \)
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8. Manan bought a bicycle that cost $55.00 when it was new. If he eventually sold it for 20% of the original cost, how much was it sold for?
To find 20% of $55.00:
- Convert 20% to a decimal: \( 20\% = 0.20 \).
- Multiply $55.00 by 0.20:
\[
55.00 \times 0.20 = 11.00
\]
Answer: \( \boxed{11.00} \)
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9. Jamar earned $40.00 for a week's work. If he paid 20% of it in taxes, how much did he pay in taxes?
To find 20% of $40.00:
- Convert 20% to a decimal: \( 20\% = 0.20 \).
- Multiply $40.00 by 0.20:
\[
40.00 \times 0.20 = 8.00
\]
Answer: \( \boxed{8.00} \)
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10. What is 20% of 75?
To find 20% of 75:
- Convert 20% to a decimal: \( 20\% = 0.20 \).
- Multiply 75 by 0.20:
\[
75 \times 0.20 = 15
\]
Answer: \( \boxed{15} \)
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Final Answers:
1. \( \boxed{3} \)
2. \( \boxed{16} \)
3. \( \boxed{4.00} \)
4. \( \boxed{17.00} \)
5. \( \boxed{11} \)
6. \( \boxed{4} \)
7. \( \boxed{10.00} \)
8. \( \boxed{11.00} \)
9. \( \boxed{8.00} \)
10. \( \boxed{15} \)
Parent Tip: Review the logic above to help your child master the concept of 8th grade percent worksheet.
