A garden is shape of a square

Question

A garden is in the shape of a square with a perimeter of  feet. The garden is surrounded by two fences. One fence is around the perimeter of the garden, whereas the second fence is  feet from the first fence on the outside. If the material used to build the two fences is  per foot, what was the total cost of the fences?

Answer 1

36/4 = 9 by 9 for the inner fence

add 6 for the outer fence, 15 by 15 with a perimeter of 2(2(15) = 60

60 + 36 = 96 feet total fence

96 x 1.46 = $140.16 = total fencing cost