100 103
= 20000
103
21218.
100 100
CI.
= (Amount)- (Principal)
=(21218 - 20000) = 1218.
Hence, the required compound interest is 1218.
Find the compound interest on 3128000 for 9 months at 10% per annum, compounded
quarterly.
Here, P=128000, R =
% per quarter
4
2
and n = 9 months = 3 quarters.
Sample 4.
Solution :
10
per quarter
Amount = 128000 x 1+
5
2 x 100
x(1
41
128000 x
40
41
41
40
40
40
=137842
C. I. = (Amount) - (Principal)
= *(137842 - 128000) = 9842.
Hence, the required compound interest is * 9842.
EXERCISE 8 D
1. Find the amount and the compound interest on 120000 at 8% per annum for 1 year, compoun
half-yearly​

100

103

= 20000

103

21218.

100 100

CI.

= (Amount)- (Principal)

=(21218 - 20000) = 1218.

Hence, the required compound interest is 1218.

Find the compound interest on 3128000 for 9 months at 10% per annum, compounded

quarterly.

Here, P=128000, R =

% per quarter

4

2

and n = 9 months = 3 quarters.

Sample 4.

Solution :

10

per quarter

Amount = 128000 x 1+

5

2 x 100

x(1

41

128000 x

40

41

41

40

40

40

=137842

C.I. = (Amount) - (Principal)

= *(137842 - 128000) = 9842.

Hence, the required compound interest is * 9842.

EXERCISE 8 D

1. Find the amount and the compound interest on 120000 at 8% per annum for 1 year, compoun

half-yearly

c. businesses/firms & government

he government should regulate the economy