Answer :

SP of the washing machine = ? 13,500 Loss = 20% CP = \(\frac{SP×100}{(100-loss%)} \) =\(\frac{13,500×100}{(100-20)} \)= \(\frac{13,500×100}{(80)} \)= Rs.16875

- Q.1 Tell what is the profit or loss in the following transactions. Also find profit per cent or loss per cent in each case. (a) Gardening shears bought for Rs.250 and sold for Rs. 325. (b) A refrigerator bought for Rs. 12,000 and sold at Rs.13,500. (c) A cupboard bought for Rs. 2,500 and sold at Rs.3,000. (d) A skirt bought for Rs. 250 and sold at Rs.150.
- Q.2 Convert each part of the ratio to Percentage: (a) 3:1 (b) 2:3:5 (c) 1 : 4 (d) 1:2:5
- 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.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?

- NCERT solutions for class 7 maths chapter 1 Integers
- NCERT solutions for class 7 maths chapter 2 Fractions and Decimals
- NCERT solutions for class 7 maths chapter 3 Data Handling
- NCERT solutions for class 7 maths chapter 4 Simple Equations
- NCERT solutions for class 7 maths chapter 5 Lines and Angles
- NCERT solutions for class 7 maths chapter 6 The Triangle and its Properties
- NCERT solutions for class 7 maths chapter 7 Congruence of Triangles
- NCERT solutions for class 7 maths chapter 8 Comparing Quantities
- NCERT solutions for class 7 maths chapter 9 Rational Numbers
- NCERT solutions for class 7 maths chapter 10 Practical Geometry
- NCERT solutions for class 7 maths chapter 11 Perimeter and Area
- NCERT solutions for class 7 maths chapter 12 Algebraic Expressions
- NCERT solutions for class 7 maths chapter 13 Exponents and Powers
- NCERT solutions for class 7 maths chapter 14 Symmetry
- NCERT solutions for class 7 maths chapter 15 Visualising Solid Shapes

- NCERT solutions for class 7 science chapter 1 Nutrition in Plants
- NCERT solutions for class 7 science chapter 2 Nutrition In Animals
- NCERT solutions for class 7 science chapter 3 Fibre to Fabric
- NCERT solutions for class 7 science chapter 4 Heat
- NCERT solutions for class 7 science chapter 5 Acids Bases and Salts
- NCERT solutions for class 7 science chapter 6 Physical and Chemical Changes
- NCERT solutions for class 7 science chapter 7 Weather, Climate and Adaptations of Animals to Climate
- NCERT solutions for class 7 science chapter 8 Winds, Storms and Cyclones
- NCERT solutions for class 7 science chapter 9 soil
- NCERT solutions for class 7 science chapter 10 Respiration in Organisms
- NCERT solutions for class 7 science chapter 11 Transportation in Animals and Plants
- NCERT solutions for class 7 science chapter 12 Reproduction In Plant
- NCERT solutions for class 7 science chapter 13 Motion and Time
- NCERT solutions for class 7 science chapter 14 Electric Current and Its Effects
- NCERT solutions for class 7 science chapter 15 Light
- NCERT solutions for class 7 science chapter 16 Water: A Precious Resource
- NCERT solutions for class 7 science chapter 17 Forests: Our Lifeline
- NCERT solutions for class 7 science chapter 18 Waste Water Story