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RRB Group D Model Paper 1 with solutions
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© examsnet.com
Question : 62
Total: 100
On what sum of money will compound interest for 2 years at 10% p.a. amount to ₹ 126?
₹ 500
₹ 600
₹ 550
₹ 640
Validate
Solution:
(2) Let the principal be ₹ P.
C I = P
[
(
1
+
r
100
)
n
−
1
]
⇒ 126 = P
[
(
1
+
10
100
)
2
−
1
]
⇒ 126 = P
[
121
100
−
1
]
⇒ 126 = P
[
121
−
100
100
]
⇒ 126 = P ×
21
100
⇒ P = ₹
126
×
100
21
⇒ P = ₹ 600
© examsnet.com
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