Question 214084
87 feet long, 42 feet wide and 8 feet deep
87*42*8=29,232^3 ft.
3*3*3=27 ft^3=1^3 yard.
29,232/27=1,082.667^3 yds. 
1,082.667*3.50=$3,789.33 is the cost of the excavation.