No of turns per minute (N)

Weight of Urea per turn (gm), Y

N * Y

Total weight of fallen Urea per minute (kg), X

Over falling = $\frac{\left(N\ast Y-X\right)}{\left(N\ast Y\right)}\ast 100$

Both hopper

18

28

504

480

4.76

16

26.5

424

400

5.66

17

29

493

470

4.66

17

27

459

430

6.32

Average

5.35