The simple interest on a sum of money is 1/4th of the principal

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The simple interest on a sum of money is 1/4th of the principal and the number of years is equal to rate per cent per annum. The rate per cent is

Let the principal be p and rate be r% per annum.
According to the question,

∴ SI =	Principal × Time × Rate
	100

⇒	p	=	p × r × r
	4		100

r² =	100	= 25
	4

⇒ r = √25 = 5% per annum
Second method to solve this question :

Here , R = T , n =	1
	5

RT = n × 100

R² =	1	× 100
	4

R² = 25
∴ R = 5%