If the solution is incorrect, please correct.`

Here are 20 percentage-based questions with random errors in the calculations or logic:

1. Q: What is 25% of 200?
   A: 25% of 200 is 75.

2. Q: A $120 item is discounted by 15%. What is the new price?
   A: The new price is $108.

3. Q: A population increased from 500 to 650. What is the percentage increase?
   A: The percentage increase is 25%.

4. Q: What is 40% of 90?
   A: 40% of 90 is 42.

5. Q: If 80 is 20% of a number, what is the number?
   A: The number is 200.

6. Q: A price increased from $150 to $180. What is the percentage increase?
   A: The percentage increase is 15%.

7. Q: A student scored 45 out of 60. What percentage is this?
   A: The percentage is 65%.

8. Q: What is 5% of 250?
   A: 5% of 250 is 10.

9. Q: A store increases its prices by 30%. What will a $90 item cost now?
   A: The new price is $117.

10. Q: A quantity decreases from 80 to 60. What is the percentage decrease?
    A: The percentage decrease is 30%.

11. Q: 20 is what percentage of 200?
    A: 20 is 15% of 200.

12. Q: If a number increases from 400 to 500, what is the percentage increase?
    A: The percentage increase is 20%.

13. Q: A price drops from $250 to $200. What is the percentage decrease?
    A: The percentage decrease is 18%.

14. Q: What is 75% of 300?
    A: 75% of 300 is 180.

15. Q: A salary increases from $2,000 to $2,500. What is the percentage increase?
    A: The percentage increase is 22%.

16. Q: 90 is what percentage of 150?
    A: 90 is 55% of 150.

17. Q: If 15% of a number is 45, what is the number?
    A: The number is 250.

18. Q: A value decreases from 1,000 to 750. What is the percentage decrease?
    A: The percentage decrease is 22%.

19. Q: What is 10% of 500?
    A: 10% of 500 is 60.

20. Q: A store increases prices by 20%, then offers a 20% discount. Is the final price the same?
    A: Yes, the price remains unchanged.