Question

9. Find the compound interest at the rate of 5% for three years on that principal which in the
years at the rate of 5% per annum gives * 1200 as simple interest.
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Answer 1

r=5%p.a

n = 3 years

Si=1200

si=p×r×t/100

p= 100×si /r×t

100×1200/5×3= 400× 20

= 80000

therefore principal =8000

compound interest =a-p

= 12000- 8000

= 4000

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