In how much time sum of money becomes 6 times at 25% simple interest?

25 years 15 years 20 years 30 years

20 years

6 times means: If Principal = 1R, then Amount = 6R, so SI = 5R T =\(\frac{SI × 100}{PR}\) =  \(\frac{5 × 100}{1 × 25}\) = 20 years