A particular manufacturing job is subject to an estimated 60% learning curve. The first unit required 20 hours to complete. A doubling of production will reduce the cumulative average unit completion time by

a. 40 %

b. 50%

c. 20%

d. 80%

What is the cumulative average time per unit after four units are completed?

a. 60 hours

b. 7.20 hours

c. 28.80 hours

d. 40 hours

What is the cumulative total time required to produce 4 units?

a. 40 hours

b. 39.20 hours

c. 28.80 hours

d. 7.20 hours