# RS Aggarwal Class 8 Math Ninth Chapter Percentage Exercise 9C Solution

## EXERCISE 9B

### OBJECTIVE QUESTIONS

#### Tick (√) the correct answer in each of the following: (2) 0.8% when expressed as a decimal, is (3) 6 : 5 when expressed as a percentage, is (4) 5% of a number is 9. The number is

Solution: Let the required number be x. Then,

5% of x = 9 Ans: (d)

(5) What per cent of  90 is 120? (6) What percent of 10 kg is 250g?

Ans: Here 10 kg = 10,000 g (7) 40% of  ?= 240 (8) ?% of 400 = 60 Ans: (c)

(9) (180% of ?) ÷ 2 =504 Ans: (d)

(10) 20% of Rs 800 = ? (11) In an examination, Nitin gets 98 marks. This amounts to 56% of the maximum marks. What are the maximum marks?

Solution: Let the maximum marks be x. Ans: (c)

(12) A number is first increased by 10% and then reduce by 10%. The number

Ans: (b) decreases by 1%

(13) A period of 4 hours 30 min is what per cent of a day?

Ans: Here 4 hours 30 min = (240 + 30) =  270 min

A day = 24 hours = (24 × 60) = 1440 min (14) In an examination, 65% of total examinees passed. If the number of failures is 420, the total number of examinees is

Solution: Let the total number of examinees be 100.

Percentage of examinees passed = 65%

Percentage of examinees failed = (100 – 65)% = 35% Ans: (c)

(15) A number exceeds 20% of itself by 40. The number is

Solution: Let the number be x. Ans: (a) (17) 0.05 is what per cent of 20? (18) One-third of 1206 is what per cent  of  134? (19) x% of y % of?

Solution: Let the required number be z. Then,

x% of y = y% of z Ans: (a)

(20) What per cent of 2/7 is 1/35? Updated: May 30, 2022 — 2:20 pm