Page 121 - ICSE Math 6

EXERCISE 9.1

1. Fill in the blanks.

(a) 75 marks out of 100 marks is __________ per cent.
(b) 10 pens out of 100 pens is __________ per cent.

(c) 23 per cent = __________ out of 100
(d) 31 per cent = 31 out of __________
2. Express:

(a) 40 s as a percentage of 100 s (b) 14 kg as a percentage of 50 kg
(c) ` 210 as a percentage of ` 1,260 (d) 18 g as a percentage of 1 kg

3. What percentage of ` 550 is ` 50?
4. In a class of 70 students, 45 students passed a Mathematics test. What is the passing percentage
of students?
5. Find 45% of 5,000.
6. Sharad earned ` 15,000. He spend 30% of the amount earned on household expenses, 20% of
the remaining amount on shopping and saved the rest. What amount did he save?

7. Find the number if its 26% is 234.
8. The 12% of a number is 216. What is the number?

9. Samir scored 90% marks in his annual examination out of a total of 600 marks. How many marks
did he get?

Applications of Percentage

Example 7: Rohan’s monthly salary is 3% more than Rahul’s salary. If Rahul’s salary is ` 17,000,
then find Rohan’s salary.
3
Solution: 3% of Rahul’s salary = × ` 17,000 = ` 510
100
So, Rohan’s salary = Rahul’s salary + (3% of Rahul’s salary)
= ` 17,000 + ` 510 = ` 17,510

Example 8: A team has to score 60% of the given score to win a match. If the team scores 115 runs
and loses the match by 5 runs, then find the given score.
Solution: Score required to win the match = 115 runs + 5 runs = 120 runs
\ 60% of the given score = 120 runs

 60  100
⇒ Given score = 120 ÷   = 120× = 200
 100  60
Example 9: In a basket of apples, 24 out of 120 apples are rotten. What percentage of apples are
eatable?
Solution: Total number of apples = 120
Number of rotten apples = 24

\ Eatable apples = 120 – 24 = 96

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