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A certain sum of money invested at simple interest amounts to Rs. 990 in 3 years and to Rs. 1125 in 43 years.
What is tlie rate of interest per annum?
W
0 130
WIN 12.5°
MD 1290
13.5
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Answer:
13%
Step-by-step explanation:
Amount in 2 years = Rs. 756
Amount is 3
2
1
years = Rs. 873
∴ Interest for 1
2
1
years = Rs. 873− Rs. 756= Rs. 117
Interest for 2 years =
2
3
117
×2=
3
117×2×2
= Rs. 156
Interest for 1 year =
3
117×2
= Rs. 78
∴ Principal =Amount−Interest ....(for 2 years) = Rs. 756− Rs. 156= Rs. 600
∴ Rate of interest =
600×1
78×100
=13% p.a.
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