Let the principal = ₹ x
Simple Interest (I) = ₹ \frac{3 x}{8} \\
Time (t) = 6 years
Rate (r) = ?
Rate = \frac{\text { Interest } \times 100}{\text { Principal } \times \text { Time }}=\frac{\frac{3}{8} \times 100}{x \times 6} \\
=\frac{3}{8} \times \frac{100}{6}=\frac{25}{4}=6 \frac{1}{4} \\
∴ Rate =6 \frac{1}{4} \\ %