Final answer:
The unit rate of shrimp is $21.00 per pound. Jack paid $105.00 for the additional 5 pounds of shrimp.
Step-by-step explanation:
Jack bought 12 pounds of shrimp for $252.00. To find the unit rate, we divide the total cost by the total weight in pounds.
Unit rate = $252.00 ÷ 12 pounds = $21.00 per pound
Now, we need to determine how much Jack paid for the additional 5 pounds of shrimp. Since we found out that the cost per pound is $21.00, we multiply this unit price by the additional pounds.
Cost for 5 pounds = 5 pounds × $21.00 per pound = $105.00
Jack paid $105.00 for the additional 5 pounds of shrimp.