Final answer:
The total cost of Mark's purchases is $6.14.
Step-by-step explanation:
To find the total cost of Mark's purchases, we need to add up the cost of each item. The box of dog biscuits costs $1.49, the box of detergent costs $3.40, and the package of lunch meat costs $1.25. Adding these amounts together:
$1.49 + $3.40 + $1.25 = $6.14
So, the total cost of Mark's purchases is $6.14.