Page 114 - Math Skill - 5

112 Maths

Exercise 8.4

1. A metal alloy contains 43% zinc and the rest is iron. Find the quantity of each metal in
2150 g of this alloy.
2. Thirty-five per cent of the plants in the park are broad-leafed plants and the rest are grasses.
What per cent of the plants are grasses?

3. Out of 2400 students of a school, only 60% passed. How many students failed?
4. The monthly budget of a family is ` 9000. If 6% of the budget is spent in buying books, how
much amount is spent on books?

5. A food item contains total of 1200 calories. If 144 calories come from fat then what per cent
of the total calories come from fat?

6. If Vicky scored 80% marks out of a total of 800 marks. How many marks did he get?

Profit and Loss

In our day-to-day life, we often deal with the concepts of profit and loss. Let’s understand the
terms involved in profit and loss.

Cost price
The price at which we buy a thing is called its cost price. It is denoted as C.P.

Selling price

The price at which we sell a thing is called its selling price. It is denoted as S.P.

Profit

When selling price is more than cost price, we earn profit.

Profit
for Profit, S.P. > C.P. Profit = S.P. – C.P. Profit % = C.P. ×100%

Loss

When cost price is more than selling price, we suffer a loss.

for Loss, C.P. > S.P. Loss = C.P. – S.P. Loss % = Loss ×100

C.P.

Fact-o-meter

� If S.P. = C.P. then neither profit nor loss occurs.
� C.P. = S.P. – Profit, S.P. = C.P. + Profit, C.P. = S.P. + Loss, S.P. = C.P. – Loss
� Profit % or Loss % are always calculated on cost price.