The percentage of value of shipments that come from materials for the average manufacturer is: a. greater than or equal to 40 and less than or equal to 49 percent. b. greater than or equal to 50 and less than or equal to 59 percent. c. greater than or equal to 60 and less than or equal to 69 percent. d. greater than or equal to 70 percent. 10. Fed up with her working conditions at the call center, Lisa decides to invest in a state-of-the-art sewing machine and produce limited quantities of her own clothing designs. After a few months of operation, she decides to apply some of the forecasting techniques she mastered in school. Which of these statements about her forecasts is correct? a. Her forecasts will probably be 100% accurate. b. Her demand forecasts for a year from now will probably be more accurate than her demand forecasts for three months from now. c. Her demand forecasts for each style of skirt will be less accurate than her demand forecasts for all skirts. d. The best way for her to determine the amount of fabric she needs is to forecast it based on her customer orders for each type of skirt.