In how many years will a sum of ₹90 become ₹108 at $6\frac{1}{4}\%$ simple interest?

$3\frac{1}{5}$ years $4\frac{1}{5}$ years $2\frac{1}{5}$ years $6\frac{1}{5}$ years

$3\frac{1}{5}$ years

We know , Simple interest = \(\frac{ P × R × T}{100}\) Amount = Principal + Interest 108 = 90 + Interest Interest = 18 18 = \(\frac{ 90 × 6.25 × T}{100}\) 1800 = 562.5 × T T = 3.2 year = 3\(\frac{ 1}{5}\) year