The answer is D) 15 square units for the formula of a parallelogram is length times height, the way I solved it was I graphed to get a visual and understand , I see that the height is 3 and the length is 5 so 3•5 is 15
( feel free to ask follow up questions)
Step-by-step explanation:

You would write the following proportion: 4/12= 180/x
When you solve the proportion the answer is 540, which means that 12 game packet costs $540.