In what time will 72 become ₹81 at 61% per annum simple

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Let the time be t years.
Simple Interest = Amount - Principle = ₹(81 – 72) = ₹9
We know that ,

SI =	P × R × t
	100

9 =	72 × 25 × t
	4 × 100

⇒ t =	9 × 400	= 2yrs
	72 × 25

In what time will 72 become ₹81 at 6	1	% per annum simple interest ?
	4