Review Comments of Math Practice Questions Air Class

Question 1:

Answer: 28000
Steps:

  • Correctly calculated 20% profit on 50 laptops: 4800 - 4000 = 800 profit per laptop.
  • Correctly calculated total profit for 50 laptops: 800 × 50 = 40000.
  • Correctly calculated 75% of selling price for remaining 30 laptops: 3600.
  • Correctly calculated loss per laptop: 3600 - 4000 = -400.
  • Correctly calculated total loss for 30 laptops: -400 × 30 = -12000.
  • Correctly added profits and losses: 40000 + (-12000) = 28000.

Feedback: Well done! All steps and the final answer are correct.

Question 2:

Answer: C=1000
Steps:

  • Correctly set up the equations: MP = 1.2C, SP = 0.8MP.
  • Correctly substituted and simplified: C - 0.96C = 40.
  • Correctly solved for C: 0.04C = 40 → C = 1000.

Feedback: Excellent work! The steps and final answer are correct.

Question 3:

Answer: The shopkeeper did not profit; the net result was zero.
Steps:

  • Correctly identified that the profit and loss cancel each other out.

Feedback: Correct! The net profit is zero.

Question 4:

Answer: After 3 years of simple interest he will earn $192 and it will take him 8 years to earn 512 dollars of interest.
Steps:

  • Correctly calculated yearly interest: 8% of 800 = 64.
  • Correctly calculated total interest for 3 years: 64 × 3 = 192.
  • Correctly calculated time to earn 512: 512 / 64 = 8 years.

Feedback: Perfect! All steps and answers are correct.

Question 5:

Answer: $530.45
Steps:

  • Correctly calculated first year interest: 3% of 500 = 15 → 515.
  • Correctly calculated second year interest: 3% of 515 = 15.45 → 530.45.

Feedback: Great job! The steps and final answer are correct.

Overall Score: 10