The simple interest on a certain sum at 5% per annum for

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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 :

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