Cost for each:
box of cards=$12.95
stamp=0.44
Number of quantity for each:
box of cards=1
stamp=16
Now the equation should be as follow:
quantity(box of cards)+quantity(stamp)
1($12.95)+16($0.44)
$12.95+$7.04
$19.99
The total cost is $19.99 or simply 19 dollars and 99 cents