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(a) 3:1

(b) 2:3:5

(c) 1 : 4

(d) 1:2:5

Answer :

(a) 3 : 1

Sum of the ratio parts = 3 + 1 = 4

Percent of first part = \(\frac{3}{4} \) × 100 = 75%

Percent of second part = \(\frac{1}{4} \) × 100 = 25 %

(b) 2:3:5

Sum of the ratio parts = 2 + 3 +5 = 10

Percent of first part = \(\frac{2}{10} \) × 100 = 20%

Percent of second part = \(\frac{3}{10} \) × 100 = 30 %

Percent of second part = \(\frac{5}{10} \) × 100 = 50 %

(c) 1 : 4

Sum of the ratio parts = 1 + 4= 5

Percent of first part = \(\frac{1}{5} \) × 100 = 20%

Percent of second part = \(\frac{4}{5} \) × 100 = 80 %

(d) 1:2:5

Sum of the ratio parts = 1+ 2 +5 = 8

Percent of first part = \(\frac{1}{8} \) × 100 = 12.5%

Percent of second part = \(\frac{2}{8} \) × 100 = 25 %

Percent of third part = \(\frac{5}{8} \) × 100 = 62.5%

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- Q.3 The population of a city decreased from 25,000 to 24,500. Find the Percentage decrease.
- Q.4 Arun bought a car for ? 3,50,000. The next year, the price went upto ? 3,70,000. What was the Percentage of price increase?
- Q.5 I buy a TV for Rs.10,000 and sell it at a profit of 20%. How much money do I get for it?
- Q.6 Juhi sells a washing machine for Rs.13,500. She loses 20% in the bargain. What was the price at which she bought it?
- Q.7 (i) Chalk contains calcium, carbon and oxygen in the ratio 10 : 3 : 12. Find the Percentage of carbon in chalk. (ii) If in a stick of chalk, carbon is 3 g, what is the weight of the chalk stick?
- Q.8 Amina buys a book for Rs.275 and sells it at a loss of 15%. How much does she sell it for?
- Q.9 Find the amount to be paid at the end of 3 years in each case. (a) Principal = Rs. 1200 at 12% p.a. (b) Principal = Rs. 7500 at 5% p.a.
- Q.10 What rate gives Rs. 280 as interest on a sum of Rs.56,000 in 2 years?
- Q.11 If Meena gives an interest of Rs. 45 for one year at 9% rate p.a. What is the sum she has borrowed?

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