Step 1: Monthly Drawings Calculation
Monthly drawings amount = ₹ 20,000
Total number of months = 12
Total drawings for the year = ₹ 20,000 × 12 = ₹ 2,40,000
Step 2: Interest on Drawings (withdrawn at the beginning of each month)
\[\text{Interest} = \frac{Total Drawings × Rate × (n+1)}{2 × 12 × 100}\]
\[= \frac{2,40,000 × 6 × 13}{2 × 12 × 100} = ₹ 3,600\]