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  1. The simple interest on a certain sum at 5% per annum for 3 years and 4 years differ by 42. The sum is :
    1. ₹210
    2. ₹280
    3. ₹750
    4. ₹840
Correct Option: A

According to question,
Interest of one year = ₹42
Rate = 5% and Time = 1 year

∴ Principal =
Interest × 100
Rate × Time

=
42 × 100
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 =
20P - 15P
100

P = 42 × 20
P= ₹840



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