Alisa sees another brand of sand at the same store. She sees that Brand B is 150 pounds for $12. How much is the unit rate? A.$12.50
B.$13.75
C.$14.25

Use pythagorean’s theorem and find the missing side lengths of the two smaller triangles and add them together
13^2 - 12^2 = 5
15^2 - 12^2 = 9
5+9 = 14
14 is the length of each side of the square
14^2 + 14^2 = 19.8
19.8 is the diagonal length of the inside if the square