Answer:
6 kanban cards
Explanation:
Note: The full question is attached as picture below
D = 1800 parts/day
C = 175 items
LT = 0.25 days
SS = 650 Parts
N = {D*LT + SS]/C
N = [(1,800*0.25) + 650] / 175
N = (450 + 650) / 175
N = 1100 / 175
N = 6.29
N ≅ 6
So, if the company wants a safety stock of 650 of these parts, approximately, 6 kanban cards are needed.