ISSB - PAF Officer Selection Mathematics Percentages — Set 2

1. Question 1

   Q1. SI on Rs 1000 at 10% for 3 years is:

   • A) Rs 200
   • B) Rs 300
   • C) Rs 250
   • D) Rs 350

   Answer: Rs 300

   Explanation: SI equals 1000 times 10 times 3 over 100, which is 300.

2. Question 2

   Q2. What is 10% of 10% of 500?

   • A) 5
   • B) 10
   • C) 15
   • D) 50

   Answer: 5

   Explanation: Ten percent of 500 is 50. Ten percent of 50 is 5.

3. Question 3

   Q3. A sum doubles in 8 years at SI. Rate is:

   • A) 10%
   • B) 12.5%
   • C) 15%
   • D) 8%

   Answer: 12.5%

   Explanation: To double, interest equals principal. Rate is 100 over 8, which is 12.5 percent.

4. Question 4

   Q4. What percent of 40 is 8?

   • A) 15%
   • B) 20%
   • C) 25%
   • D) 10%

   Answer: 20%

   Explanation: Eight over 40 times 100 equals 20 percent. Work each step carefully; ISSB math rewards accuracy under time pressure.

5. Question 5

   Q5. What is 30% of 90?

   • A) 18
   • B) 27
   • C) 30
   • D) 36

   Answer: 27

   Explanation: Thirty percent of 90 is 0.3 times 90, which equals 27. Work each step carefully; ISSB math rewards accuracy under time pressure.

6. Question 6

   Q6. SI on 1500 at 8% for 2 years:

   • A) Rs 200
   • B) Rs 240
   • C) Rs 280
   • D) Rs 300

   Answer: Rs 240

   Explanation: SI equals 1500 times 8 times 2 over 100, which is 240.

7. Question 7

   Q7. What is 5% of 5% of 400?

   • A) 1
   • B) 2
   • C) 4
   • D) 5

   Answer: 1

   Explanation: Five percent of 400 is 20. Five percent of 20 is 1.

8. Question 8

   Q8. What percent of 80 is 16?

   • A) 15%
   • B) 20%
   • C) 25%
   • D) 30%

   Answer: 20%

   Explanation: Sixteen over 80 times 100 equals 20 percent. Work each step carefully; ISSB math rewards accuracy under time pressure.

9. Question 9

   Q9. A sum becomes 1.5 times in 4 years SI. Rate:

   • A) 10%
   • B) 12.5%
   • C) 15%
   • D) 20%

   Answer: 12.5%

   Explanation: Interest is half principal in 4 years. Rate is 50/4 = 12.5 percent.

10. Question 10

    Q10. 15% of a number is 45. Number is:

    • A) 250
    • B) 300
    • C) 350
    • D) 400

    Answer: 300

    Explanation: If 15% is 45, the number is 45 times 100 over 15, which is 300.

11. Question 11

    Q11. What is 25% of 80?

    • A) 15
    • B) 20
    • C) 25
    • D) 30

    Answer: 20

    Explanation: Twenty five percent of 80 is one quarter of 80 which is 20.

12. Question 12

    Q12. Increase 200 by 15%. New value?

    • A) 215
    • B) 220
    • C) 230
    • D) 240

    Answer: 230

    Explanation: Fifteen percent of 200 is 30 so new value is 230. Work each step carefully; ISSB math rewards accuracy under time pressure.

13. Question 13

    Q13. What percent is 18 of 72?

    • A) 20%
    • B) 25%
    • C) 30%
    • D) 35%

    Answer: 25%

    Explanation: 18 divided by 72 times 100 equals 25 percent. Work each step carefully; ISSB math rewards accuracy under time pressure.

14. Question 14

    Q14. A number decreased by 20% becomes 160. Original?

    • A) 180
    • B) 192
    • C) 200
    • D) 220

    Answer: 200

    Explanation: 160 is 80 percent of original so original is 160 divided by 0.8 equals 200.

15. Question 15

    Q15. Population 50000 increases 4%. New population?

    • A) 52000
    • B) 52500
    • C) 54000
    • D) 55000

    Answer: 52000

    Explanation: Four percent of 50000 is 2000 so new total is 52000. Work each step carefully; ISSB math rewards accuracy under time pressure.

16. Question 16

    Q16. What is 20% of 150?

    • A) 25
    • B) 30
    • C) 35
    • D) 40

    Answer: 30

    Explanation: Twenty percent of one fifty is zero point two times 150 equals 30.

17. Question 17

    Q17. Number increased from 80 to 100. Increase percent?

    • A) 20%
    • B) 25%
    • C) 30%
    • D) 40%

    Answer: 25%

    Explanation: Increase 20 on base 80 is 20/80 times 100 equals 25 percent.

18. Question 18

    Q18. Discount 20% on 500 equals SP?

    • A) 350
    • B) 380
    • C) 400
    • D) 420

    Answer: 400

    Explanation: Twenty percent off 500 is 100 so SP is 400. Work each step carefully; ISSB math rewards accuracy under time pressure.

19. Question 19

    Q19. Population 8000 decreases 5%. New population?

    • A) 7400
    • B) 7600
    • C) 7800
    • D) 7900

    Answer: 7600

    Explanation: Five percent of 8000 is 400 so new total is 7600. Work each step carefully; ISSB math rewards accuracy under time pressure.

20. Question 20

    Q20. What percent is 45 of 180?

    • A) 20%
    • B) 25%
    • C) 30%
    • D) 35%

    Answer: 25%

    Explanation: 45 divided by 180 times 100 equals 25 percent. Work each step carefully; ISSB math rewards accuracy under time pressure.