Question : What is the compound interest on Rs. 8400 for 2 years at 10% per annum compounded annually?
Option 1: Rs. 10164
Option 2: Rs. 840
Option 3: Rs. 5064
Option 4: Rs. 1764
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Correct Answer: Rs. 1764
Solution : We have, Principal = Rs. 8400 Rate = 10% per annum Time = 2 years $\text{Compound Interest}=\text{Principal}×(1+\frac{\text{Rate}}{100})^{\text{Time}}-\text{Principal}$ $⇒\text{Compound Interest}=8400×(1+\frac{\text{10}}{100})^{\text{2}}-\text{8400}$ $⇒\text{Compound Interest}=8400×(\frac{\text{11}}{10})^{\text{2}}-\text{8400}$ $⇒\text{Compound Interest}=8400×(\frac{\text{121}}{100})-\text{8400}$ $⇒\text{Compound Interest}=84×121-\text{8400}$ $\therefore\text{Compound Interest}=10164-\text{8400}=1764$ Hence, the correct answer is Rs. 1764.
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Question : What is the difference between the compound interest and the simple interest on Rs. 2,000 at 10% interest per annum for 2 years, if, for compound interest, interest is compounded annually?
Option 1: Rs. 20
Option 2: Rs. 40
Option 3: Rs. 80
Option 4: Rs. 60
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Option 2: Rs. 34563.12
Option 3: Rs. 36630.60
Option 4: Rs. 3254.98
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Option 2: Rs. 2,646
Option 3: Rs. 3,646
Option 4: Rs. 2,645
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Option 2: Rs. 50,250
Option 3: Rs. 56,250
Option 4: Rs. 52,255
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Option 2: Rs. 6345.51
Option 3: Rs. 2778.81
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