Principal (P) = ₹ 600
Rate (r) = 8 %
Interest (I) = ₹ 168
Time = ?
Time = \frac{\text { Interest } × 100}{\text { Principal } × \text { Rate }} \\
= \frac{168 × 100}{600 × 8}
= \frac{21}{6}
= \frac{7}{2} yrs=3 \frac{1}{2} \\ yrs
∴ Time = 3\frac{1}{2} yrs