Helio Co. owns a large gantry crane for moving around heavy items in their warehouse. The following analysis was done the forklift. What was the interest rate used in this analysis? Year Marginal Cost PWO Sum PW, Total AW 0 1 N 3 $6,500 $7,150 $7,865 $8,652 $9,517 $6,075 $6,245 $6,420 $6,600 $6,785 $6,075 $12,320 $18,740 $25,340 $32,125 $6,500 $6,814 $7,141 $7,481 $7,835 4 5 10.0% 7.5% 7.0% 5.0% 9.0%