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SSC CHSL 7-Jan-2017 Shift 1 Paper
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© examsnet.com
Question : 54
Total: 100
There is 75% increase in an amount in 5 years at simple interest. What will be the compound interest of Rs 40000 after 2 years at the same rate?
Rs 25800
Rs 32250
Rs 12900
Rs 19350
Validate
Solution:
Let the rate of interest =
r
%
Let sum invested under simple interest = Rs.
100
x
and time period = 5 years
⇒ Interest earned
=
75
100
×
100
x
=
R
s
.75
x
Simple interest =
P
×
R
×
T
100
⇒
100
x
×
r
×
5
100
=
75
x
⇒
r
=
75
5
=
15
%
Sum invested under compound interest = Rs. 40,000 and time period = 2 years
⇒ Compound interest =
P
[
(
1
+
R
100
)
T
−
1
]
=
40
,
000
[
(
1
+
15
100
)
2
−
1
]
=
40
,
000
[
(
23
20
)
2
−
1
]
=
40
,
000
(
529
−
400
400
)
=
100
×
129
=
R
s
.12
,
900
© examsnet.com
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