Chapter 5
5.28
Now,
P
=
800,
T
=
2 and S.I.
=
208.
Therefore, rate
=
(
)
(
)
(
)
(
)
%
100
100
208
800
2
13
×
×
=
×
×
=
S.I.
P
T
Therefore, (b) is the correct answer.
Example 129:
The simple interest on a certain sum of
money for
2
1
2
years at 12
%
per annum is
`
40 less than
the simple interest on the same sum for
3
1
2
years at
10
%
per annum. Find the sum.
(a)
`
600
(b)
`
666
(c)
`
780
(d)
`
800
Explanation
Let the sum be
`
x
.
Then we can write:
(
)
(
)
x
×
×
×
10
7
100
2
–
(
)
(
)
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