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The simple interest on a certain sum at 5% per annum for 3 years and 4 years differ by 42. The sum is :
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- ₹210
- ₹280
- ₹750
- ₹840
- ₹210
Correct Option: A
According to question,
Interest of one year = ₹42
Rate = 5% and Time = 1 year
∴ Principal = | |
Rate × Time |
= | |
5 × 1 |
Second method to solve this question :
P1 = P, R1 = 5%,
T1 = 3years. P2 = P,
R2 = 5%, T2 = 4 years.
Difference in SI = 42
42 = | |
100 |
P = 42 × 20
P= ₹840