What does it mean for a company to have a 70 percent learning curve? a. A 70 percent learning curve indicates a 70 percent drop every time output is doubled. b. A 70 percent learning curve indicates a 30 percent drop every time output increases by 70 percent. c. A 70 percent learning curve indicates a 30 percent drop every time output increases by 30 percent. d. A 70 percent learning curve indicates a 30 percent drop every time output is doubled