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Byju's Answer
Standard VII
Mathematics
Application of Simple Interest in Real Life Situations
At what rate ...
Question
At what rate per cent of simple interest will a sum of money double itself in
12
years?
A
7
1
2
%
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B
8
1
3
%
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C
10
%
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D
12
%
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Solution
The correct option is
B
8
1
3
%
In case of Simple interest, total amount
A
is,
A
=
P
(
1
+
r
t
100
)
where
P
=
Principal
r
=
interest rate
t
=
time (in years)=
12
(given)
After
12
years, Sum of money doubles itself,
that is
A
=
2
P
Now apply the formula,
A
=
P
(
1
+
r
t
100
)
2
P
=
P
(
1
+
12
r
100
)
2
=
1
+
12
r
100
1
=
12
r
100
Therefore,
r
=
100
12
=
8
1
3
percent
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