Review Comments of Math Practice Questions Air Class 3
Question 1: Simple Interest Calculation
Final Answer:
- (a) $180
- (b) 5 years
Solving Steps:
- Correctly calculated simple interest for 3 years ($60/year × 3 = $180).
- Correctly solved for years to reach $300 ($300 ÷ $60/year = 5 years).
Feedback:
- All steps and answers are correct. Well done!
Score:
- Final Answer: 1
- Solving Steps: 1
Total: 2
Question 2: Profit and Loss on Bicycles
Final Answer:
- $800 profit
Solving Steps:
- Correctly calculated profit on 20 bikes ($1,000).
- Correctly calculated loss on 10 bikes ($200).
- Net profit correctly derived ($1,000 - $200 = $800).
Feedback:
- Clear and accurate calculations. Great job!
Score:
- Final Answer: 1
- Solving Steps: 1
Total: 2
Question 3: Marked Price and Discount
Final Answer:
- $147.37 (rounded)
Solving Steps:
- Correctly set up equations for marked price (140%C) and selling price (85%MP).
- Solved algebraically to find cost price (C ≈ $147.37).
Feedback:
- Steps are logically sound, but the final answer should be rounded to 2 decimal places ($147.37).
Score:
- Final Answer: 1
- Solving Steps: 1
Total: 2
Question 4: Comparing Two Sales (Profit vs. Loss)
Final Answer:
- (a) Loss
- (b) $1,000
Solving Steps:
- Correctly calculated cost prices ($10,000 and $15,000).
- Correctly identified net loss ($3,000 loss - $2,000 profit = $1,000).
Feedback:
- Perfectly reasoned and answered.
Score:
- Final Answer: 1
- Solving Steps: 1
Total: 2
Question 5: Compound Interest vs. Simple Interest
Final Answer:
- $15.25 more with compound interest.
Solving Steps:
- Simple interest correctly calculated ($300 total).
- Compound interest correctly calculated ($315.25 total).
- Difference accurately derived ($15.25).
Feedback:
- Flawless work. The explanation is clear and calculations are spot-on.
Score:
- Final Answer: 1
- Solving Steps: 1
Total: 2