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SSC CGL Tier 2 Exam 25 Oct 2015 Paper 1
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Question : 23
Total: 100
A sum of money placed at compound interest doubles itself in 5 years. It will amount to eight times of itself at the same rate of interest in
20 years
10 years
12 years
15 years
Validate
Solution:
(4)
A
=
P
(
1
+
R
100
)
n
⇒
2
P
=
P
(
1
+
R
100
)
5
On cubing both sides,
2
3
=
(
1
+
R
100
)
5
×
3
⇒
8
=
1
(
1
+
R
100
)
15
∴ Required time = 15 years
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