Interest on Rhea’s drawings is calculated as follows:
- Rhea withdrew ₹ 30,000 at the beginning of each half year.
- For the first withdrawal (₹ 30,000) at the beginning of the first half year, it remained in the firm for 12 months:
\[
Interest} = \frac{30,000 \times 10\% \times 12}{12} = ₹ 3,000
\]
- For the second withdrawal (₹ 30,000) at the beginning of the second half year, it remained in the firm for 6 months:
\[
Interest} = \frac{30,000 \times 10\% \times 6}{12} = ₹ 1,500
\]
Therefore, the total interest on Rhea's drawings is:
\[
3,000 + 1,500 = ₹ 4,500.
\]