If critical speed is 55% more of operating speed and N is 0.81, what is critical speed?

If critical speed is 55% more of operating speed and N is 0.81, what

1.	If critical speed is 55% more of operating speed and N is 0.81, what is critical speed?
A.	0.26
B.	0.81
C.	0.44
D.	1.25
Answer» E.