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UPSC CDS 1 2021 Math Paper
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© examsnet.com
Question : 12
Total: 100
A sum of money was invested ate simple interest at a certain rate for 5 years. Had it been invested at 5% higher rate, it would have fetched Rs.500 more.
What was the principal amount?
Rs. 2000
Rs.1800
Rs. 1600
Rs. 1200
Validate
Solution:
👈: Video Solution
let the sum of amount is Rs. P and rate of simple interest is r% and invested it for 5 years, then
S
I
=
P
×
r
×
5
100
=
P
×
r
20
According to the question if the rate of interest was 5% more then, new S.I.
P
×
(
r
+
5
)
×
5
100
=
P
×
r
20
+
500
P
4
=
500
P
=
2000
© examsnet.com
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