Question

A store charges $32 to print 80 greeting cards and $0.33 for each additional greeting card

Answer 1

32 + 0.33c = p

where c is every card more than 80 (so if you want 82 card c = 2)
and p is the total price

Answer 2

The cost of the greeting card "first 80" = 32 / 80 = 0.4$ 

additional cards after 80 cards is "C"

The equation = ( 0.4 * 80 ) + ( 0.33 * C )