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IBPS RRB Office Assistant 2018 Paper
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© examsnet.com
Question : 80
Total: 80
The simple interest on a certain sum for 2 yr at
8
%
per annum is ₹ 225 less than the compound interest on the same sum for 2 yr at
10
%
per annum. The sum is
₹ 3200
₹ 4200
₹ 4000
₹ 3600
₹ 4500
Validate
Solution:
According to the question, Compound interest - Simple interest = 225
⇒ Principal
(
(
1
+
Rate
100
)
Time
−
1
)
−
Principal
×
Rate
×
Time
100
=
225
⇒
P
(
(
1
+
10
100
)
2
−
1
)
−
P
×
8
×
2
100
=
225
⇒
P
(
(
11
10
)
2
−
1
)
−
P
×
16
100
=
225
⇒
P
(
121
−
100
100
)
−
16
P
100
=
225
21
P
100
−
16
P
100
=
225
⇒
P
[
21
−
16
100
]
=
225
∴
P
=
225
×
100
5
=
₹
4500
© examsnet.com
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