Exercise 7.1
1. Convert the given fractional numbers to per cents
Solution :
(a)
=
(b)
=
(c)
=
(d)
=
2. Convert the given decimal fractions to per cents.
Solution :
(a)0.65
= 0.65 × 100 =
(b)2.1
= 2.1 × 100 =
(c)0.02
= 0.02 × 100 =
(d)12.35
= 12.35 × 100 =
3. Estimate what part of the figures is coloured and hence find the per cent which is coloured.
Solution :
(i) Fraction of coloured part =
∴ Percentage of coloured parts 100
=
(ii) Fraction of coloured part =
∴ Percentage of coloured parts
=
(iii) Fraction of coloured part =
∴ Percentage of coloured parts
=
4. Find
Solution :
(a)15% of 250
=
(b)1% of 1 hour
=
(c)20% of ₹ 2500
=
(d)75% of 1kg
=
5. Find the whole quantity if.
Solution :
(a)5% of it is 600
=
x =
(b)12% of it is 1080
=
y =
(c)40% of it is 500km
=
z =
(d)70% of it is 14 minutes
=
w =
(e)8% of it is 40 liters
=
v =
6. Convert given per cents to decimal fractions and also to fractions in simplest forms.
Solution :
| Per cent | Decimal form | Fraction form |
|---|---|---|
| (a) 25% | | |
| (b) 150% | | |
| (c) 20% | | |
| (d) 5% | |
7. In a city, 30% are females, 40% are males and remaining are children. What per cent are children?
Solution :
8. Out of 15,000 voters in a constituency, 60% voted. Find the percentage of voters who did not vote. Can you now find how many actually did not vote?
Solution :
9. Meeta saves ₹ 4000 from her salary. If this is 10% of her salary. What is her salary?
Solution :
10. A local cricket team played 20 matches in one season. It won 25% of them. How many matches did they win?
Solution :
Total match played by the cricket team = 20 and, a match won = 25%
According to question, Number of winning match =
=
=
=