Zahara plotted three points on a coordinate grid at ( − 4 , 5 ), ( 7 , 5 ), and ( 7 , − 1 ). She will plot a fourth point to create a rectangle on the grid. The rectangle represents the floor plan of her bedroom. Zahara wants to cover her bedroom floor with carpet. Each square unit represents 1 square foot. Zahara pays $ 264 to cover the floor in carpet. What is the unit price of 1 square foot of carpet?