Percentage Quiz: Quantitative Aptitude Practice

Spoilers! These are the Starter quiz’s answers. Easy, Medium, Hard and Mixed rounds show their own answers when you finish.

1. What is 25% of 480?

   • 96
   • 125
   • 120
   • 140

   Answer: 120. 25% is one-quarter: 480 ÷ 4 = 120.

2. A number is increased by 20% and the result is then decreased by 20%. What is the net change?

   • No change
   • 4% increase
   • 2% decrease
   • 4% decrease

   Answer: 4% decrease. Net change = 20 − 20 − (20 × 20)/100 = −4%, i.e. a 4% decrease (100 → 120 → 96).

3. A's salary is 25% more than B's. By what percentage is B's salary less than A's?

   • 25%
   • 20%
   • 22.5%
   • 18%

   Answer: 20%. If B = 100, A = 125. B is 25 less than A: 25/125 × 100 = 20%.

4. The price of petrol rises by 20%. By what percentage must a family cut consumption to keep its spending the same?

   • 16⅔%
   • 20%
   • 18%
   • 15%

   Answer: 16⅔%. Reduction = 20/(100 + 20) × 100 = 16⅔%.

5. A town's population of 10,000 grows by 10% every year. What will it be after 2 years?

   • 12,000
   • 12,200
   • 12,100
   • 11,100

   Answer: 12,100. 10,000 × 1.1 × 1.1 = 12,100 (growth compounds on the new figure each year).

6. A student scores 36 marks out of 45. What is the percentage score?

   • 75%
   • 82%
   • 85%
   • 80%

   Answer: 80%. 36/45 = 4/5 = 80%.

7. 40% of a number is 72. What is the number?

   • 180
   • 160
   • 200
   • 288

   Answer: 180. Number = 72 × 100/40 = 180.

8. In a two-candidate election, a candidate gets 35% of the votes and loses by 300 votes. How many votes were cast in total?

   • 1,200
   • 1,000
   • 900
   • 1,500

   Answer: 1,000. The winner gets 65%, so the margin is 65 − 35 = 30% of the total = 300. Total = 300 × 100/30 = 1,000.

9. Two successive discounts of 20% and 10% are equal to a single discount of:

   • 30%
   • 27%
   • 29%
   • 28%

   Answer: 28%. 100 → 80 → 72, so the single equivalent discount is 28% (20 + 10 − 20×10/100).

10. A shopkeeper marks goods 40% above cost price and gives a 10% discount. What is the profit percentage?

    • 30%
    • 28%
    • 26%
    • 24%

    Answer: 26%. If CP = 100, marked price = 140 and selling price = 140 × 0.9 = 126, so profit = 26%.