When standard output is 10 units per hour and actual output is 12 units per hour, the efficiency is ________.

When standard output is 10 units per hour and actual output is 12 unit

1.	When standard output is 10 units per hour and actual output is 12 units per hour, the efficiency is ________.
A.	75%
B.	80%
C.	90%
D.	120%
Answer» E.