Total amount withdrawn by Nandita during the year = Rs 3,00,000.
Rate of interest on drawings = 10% per annum (p.a.).
The question states that Nandita withdrew the amount "during the year". When the specific dates of drawings are not given, it is assumed that the drawings were made evenly throughout the year. In such cases, interest is calculated on the total drawings for an average period of 6 months.
Average Period = 6 months = \( \frac{6}{12} \) years.
Interest on Nandita's Drawings = Total Drawings \( \times \) Rate of Interest \( \times \) Average Period
\[
\text{Interest} = 3,00,000 \times \frac{10}{100} \times \frac{6}{12}
\]
\[
\text{Interest} = 3,00,000 \times \frac{1}{10} \times \frac{1}{2}
\]
\[
\text{Interest} = 30,000 \times \frac{1}{2} = Rs 15,000
\]