UNIT 8 5,120 HRS. (6,400 X .80) 97 97

21. Correct answer d. Average hrs. for 20 units = (5,000 + 3,000) ÷ 20 units

Average hrs. for 10 units = 5,000 ÷ 10 units

= 400 hours ÷ 500 hours

= 80% Learning rate