Answer:
b. 10% doubling
Step-by-step explanation:
Options are "a. tripling, b. 10% doubling, c. 90% tripling, d. 90% doubling, e. 10%"
In this question, 90%(0.9) learning rate means that (1-0.9)10% unit of input is reduced each time the production is doubled. In a nutshell, the learning curve percentage represents the proportion by which the amount of an input per unit of output is reduced each time production is doubled.