Jenny's father works at the local grocery store. He just finished setting up a display of soup cans in the shape of a triangle. There are 4 cans of soup in the top row. For each of the following rows, he added 2 cans of soup to each end, so there are 8 cans of soup in the second row, 12 in the third row, and so forth. How many cans of soup are in the 12th row?​