Samacheer Kalvi 7th Maths Solutions Term 3 Chapter 2 Percentage and Simple Interest Intext Questions
Samacheer Kalvi 7th Maths Solutions Term 3 Chapter 2 Percentage and Simple Interest Intext Questions
Tamilnadu Samacheer Kalvi 7th Maths Solutions Term 3 Chapter 2 Percentage and Simple Interest Intext Questions
Exercise 2.1
Try These (Text book Page No. 28)
Question 1.
Find the percentage of children whose scores fall in different categories given in table below.
Solution:
Try These (Text book Page No. 29)
Question 1.
There are 50 students in class VII of a school. The number of students involved in these activities are :
Scout: 7
Red Ribbon Club : 6
Junior Red Cross : 9
Green Force : 3
Sports : 14
Cultural activity : 11
Find the percentage of students who involved in various activities.
Solution:
Try These (Text book Page No. 30)
Question 1.
Convert the fractions as percentage.
(vi) 135 %
= 135/100 = 1.35
(vii) 0.5 %
= 0.5/100 = 0.005
Exercise 2.3
Try These (Text book Page No. 38)
Question 1.
Level of water in a tank is increased from 35 litres to 50 litres in 2 minutes, what is the Percentage of increase?
Solution:
Level of water in the tank originally = 35 litres.
Increase in the water level = amount of change = 50 – 35 = 15 litres
Think (Text book Page No. 43)
Question 1.
In simple interest, a sum of money doubles itself in 10 years. In how many years it will get triple itself.
Solution:
Let the Principal be P and Rate of interest be r % per annum.
Here the number of years n = 10 years
Given in 10 years P becomes 2 P.
A = P + I
After 2 years A = 2P
i.e. 2P = P + I
2P – P = I
Now if the amount becomes triple then A = P + I = 3P
3P = P + I
3P – P = I
2P = I
∴ After 20 years the amount get tripled.
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