Calculation of interest on drawings:
Number of drawings = 6
Amount of each drawing = 4000
Total drawings = 6 x 4000 = 24000
Number of months = [Time left after 1st drawing + Time left after last drawing]/2
\(= \frac{6+1}2\)
= 3.5 months
Hence,
Interest on drawings = \(24000 \times \frac 5{100} \times \frac{3.5}{12}\)
= 350