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Percentages ( 16 to 20 ):

# APTITUDE QUESTIONS (PERCENTAGES):

16. The population of a town increased from 1, 75,000 to 2, 62,500 in a decade. What is the average percent increase in population per year?

A) 4.37%

B) 5%

C) 6%

D) 8.75%

E) None of these

View Answer

Answer: option (B)

Explanation:

Increase in 10 years = (262500 – 175000) = 87500

Increase% = (87500/175000*100)%= 50%

∴ Required average = (50/10)%=5%

17. After deducting a commission of 5%, a T.V set costs Rs.9595. Its market price is:

A) Rs.10000

B) Rs. 10075

C) Rs.10100

D) Rs.10500

E) None of these

View Answer

Answer: option (C)

Explanation:

Let the market price be x

Then, x – 5% of x = 9595 95% of x = 9595 x = ((9595*100)/95)=10100

18. A student has to obtain 33% of the total marks to pass. He got 120 marks and failed by 45 marks. The maximum marks are:

A) 300

B) 500

C) 600

D) 700

E) None of these

View Answer

Answer: option (B)

Explanation:

Let the maximum marks be x

Then, 33% of x = 120 + 45 (33/100)x= 165 x = ((165*100)/33)= 500

19. 1100 boys and 700 girls are examined in a test. 32% of the boys and 20% of the girls pass. The percentage of the total who failed is:

A) 58%

B) 72(12/18)%

C) 64%

D) 78%

E) None of these

View Answer

Answer: option (B)

Explanation:

Total number of students = 1100 + 700 = 1800

Number of students passed = (32% of 1100 + 20% of 700) = 352 + 140 = 492

Number of failures = 1800 – 492 = 1308

∴Percentage failure = (1308/1800*100)%= 72(12/18)%

20. If 20% of a = b, then b% of 20 is the same as:

A) 4% of a

B) 5% of a

C) 20% of a

D) 10% of a

E) None of these

View Answer

Answer: option (A)

Explanation:

20% of a = b => (20/100) a=b

∴b% of 20 = (b/100*20)= ((20/100) a*1/100*20)= (4/100) a=4% of a