Description for Correct answer:
SI on Rs.8400 for 1 yr = Rs.294

Therefore, Rate of interest \( \Large \frac{100 \times 294}{8400 \times 1} = \frac{7}{2}

= 3\frac{1}{2} \)%

According to the rule of allegation,



Rate I Rate II (4%) ( 10/3%)

Rate I (4%) : Rate Il (12%) = \( \Large \frac{1}{6} \) : \( \Large \frac{1}{2} \) = 1 : 3

Therefore, Money lent at 4% = \( \Large \frac{1}{4} \times 8400 \) = Rs.2100