Leopold arranges 10 square stepping stones, as shown. The area of the arrangement is 1440 square inches. What would it cost Leopold to put decorative fencing along the top and bottom lengths if the fencing costs $2.25 per foot?

Area of the arrangement would be denoted by A and it is equal to 1440 ft^2;

Number of stepping stones would be denoted by N and it is equal to 10;

Cost of the fence would be denoted by p and it is equal to 2.25 $/feet;

formula for the final cost:

C = area / number of stones x price = A / N * p

= 1440 ft ^ 2/10 x 2.25 $/ft

= 144 x 2.25

= $324 is the final cost