Question

115
Percentage and its Applications
4. The population of a town increases by 10% annually. If the present population is 22000, find its population
a year ago
5. Manoj's income increased by 20% and then decreased by 20%. What is the total percentage change
Manoj's income?
6. In an examination Piyush scored 490 marks. If he scored 70% marks, find the maximum marks.

7. Calculations show that an angle is 37 The size obtained by drawing and measurement is 35º Find
the error per cent.
8. Chalk contains 10% calcium, 3% carbon and 12% oxygen. Find the amount (in grams) of each of these
compounds in 1 kg of chalk.
9. A candidate scored 25% marks in an examination and failed by 30 marks, while another candidate who
scored 50% marks got 20 marks more than the minimum pass marks. Find the maximum marks and
minimum pass marks.
10. There are 120 girls and 57 boys in a school. If 5% of the girls leave and no new pupils are admitted, what
percentage of the whole school will be boys ?
11. In an election, a candidate got 65% of the total valid votes. 8% of the total votes were declared invalid.
If the total number of votes cast was 6,00,000, find the number of valid votes polled in favour of the
candidate.
The sides of a rectangle are 20 cm and 15 cm. If each side of the rectangle is increased by 20%, find the
percentage increase in the area.
In an examination 2500 students appeared out of which 1100 were girls. 50% of the boys and 40% of the
girls passed the examination. What percentage of the candidates failed​

Answer 1

Answer:

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