Final answer:
The unit price for the bottled water Mrs. Edgar bought is $0.50 per bottle, calculated by dividing the total cost by the number of bottles.
Step-by-step explanation:
To calculate the unit price for Mrs. Edgar's bottled water purchase, you divide the total cost by the number of bottles in the pack. Mrs. Edgar bought an eight-pack of bottled water for $4.00.
Unit price calculation: $4.00 รท 8 bottles = $0.50 per bottle.
So, the unit price for the water is $0.50 per bottle.