During a one-month promotional campaign, Tiger Films gave either a free DVD rental or a 12-serving box of microwave popcorn to new members. It cost the store $1 for each free rental and $2 for each box of popcorn. A total of 77 new members were signed up and the store's cost for the incentives was $120. How many of each incentive were given away?

DVD Rentals:
Boxes of Popcorn: