Find the sum whose 20%is rp 15
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0
Answer:
The given G.P. is 0.15,0.015,0.0015,...
Here, a=0.15 and
r=
0.15
0.015
=0.1
⇒S
n
=
1−r
a(1−r
n
)
∴S
20
=
1−0.1
0.15[1−(0.1)
20
]
=
0.9
0.15
[1−(0.1)
20
]
=
90
15
[1−(0.1)
20
]
=
6
1
[1−(0.1)
20
]
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