8. Consider this partial report from a Solver sensitivity report: Cutting department time used: Shadow price = $2; the maximum constraint - 150 hours; The allowable increase = 90 and the allowable decrease = 50. What is the range of hours over which the shadow price will remain valid? a. 100 to 240 c. 130 to 270 b. 140 to 200 d. 150 to infinity