The difference between CI and SI on a certain principle at 10% pa for 3 years is 31. Find the principal.
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CP=P[(1+
100
r
)
n
−1]=P[(1+
100
20
)
2
−1]
CP=P[(
25
36−25
)]=
25
11P
SI=
100
P×20×2
=
5
11P
CI−SI⇒48=
25
11P
−
5
2P
P=25×48=1200
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