Answer:
The net change is -2
Step-by-step explanation:
No. of bags   Tue  Wed  Thu  Fri  Sat  Sun  Mon
Sales         5   8   2    19   22   15   3
Restock       6    12   12    18   24  0    0
Change in bags = Restock - Sales
Change in Tuesday = 6-5 = 1
Change in Wednesday = 12-8 = 4
Change in Thursday = 12-2 = 10
Change in Friday = 18-19 = -1
Change in Saturday = 24-22 = 2
Change in Sunday = 0-15 = -15
Change in Monday = 0-3 = -3
Net change = 1+4+10+(-1)+2+(-15)+(-3)=-2
Hence The net change is -2