Ben is stocking milk at the local JumboMart. The milk cooler holds 780...
Let's calculate the number of cartons of milk that will be sold during Ben's shift.
During the first hour, 75% of the milk is sold. This means 75/100 * 780 = 585 cartons of milk are sold.
After the first hour, there are 780 - 585 = 195 cartons of milk remaining.
During the second hour, 20% of the remaining milk is sold. This means 20/100 * 195 = 39 cartons of milk are sold.
After the second hour, there are 195 - 39 = 156 cartons of milk remaining.
Now, let's calculate how many cartons of milk Ben will need to restock the milk cooler.
The milk cooler originally holds 780 cartons of milk, and there are currently 156 cartons remaining. Therefore, Ben will need to restock the cooler with 780 - 156 = 624 cartons of milk.
Since there are 1000 cartons of milk in the back room, Ben will not need 1000 - 624 = 376 cartons of milk.
Therefore, the correct answer is B) 376.