NCERT Class 7 Mathematics Solutions: Chapter 8 –Comparing Quantities Exercise 8.3 Part 3

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Formula of Gain and Loss are given

Formula of Gain and Loss

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1. The population of a city decreased from. Find the percentage decrease.

Answer:

The decreased population of a city from .

Population decreased

Decreased Percentage

So, the percentage decreased is

2. Arun bought a car for . The next year, the price went up to . What was the percentage of price increase?

Answer:

Increased in price of a car from .

Amount change

So,

Increased percentage

So, the percentage of price increased is

3. I buy a T.V. for and sell it at a profit of . How much money do I get for it?

Answer:

The cost price of T.V.

Profit percent

Now,

Profit of C.P

Selling price C.P. Profit

So, he gets on selling T.V.