The diameter of the screw (D) is 20mm, the pitch of the screw (L) is 3mm. What is the mechanical advantage?

The diameter of the screw (D) is 20mm, the pitch of the screw (L) is 3

1.	The diameter of the screw (D) is 20mm, the pitch of the screw (L) is 3mm. What is the mechanical advantage?
A.	21.1
B.	20.93
C.	22.9
D.	19
Answer» C. 22.9