Final answer:
The upper bound on the number of pallet positions reserved for widgets is 600 pallets.
Step-by-step explanation:
An upper bound on the number of pallet positions reserved for widgets can be determined by calculating the maximum number of pallets that can be produced within the shelf life of 30 days.
Since the manufacturer produces an average of 20 pallets per day, we can multiply this daily production rate by the number of days in the shelf life:
20 pallets/day * 30 days = 600 pallets
Therefore, an upper bound on the number of pallet positions reserved for widgets would be 600 pallets.