Final answer:
The 3-pound bag of lunchmeat for $15.10 is the better deal because it has a lower price per pound of $5.033 compared to the 4-pound bag which is $5.375 per pound.
Step-by-step explanation:
To determine which bag of lunchmeat is the better deal, we calculate the price per pound for each option and compare them. For the 4-pound bag selling for $21.50, we divide 21.50 by 4 to get the price per pound, which is $5.375 per pound.
For the 3-pound bag selling for $15.10, we divide 15.10 by 3 to get the price per pound, which is $5.033 per pound. Comparing these two amounts, the 3-pound bag at $5.033 per pound is a better deal than the 4-pound bag at $5.375 per pound.