F _l = 3,000 Lb And $M A = \frac { 75 } { 1 }$

F _l = 3,000 lb and   $M A = \frac { 75 } { 1 }$ . Find F _s .

A) 40 lb
B) 80 lb
C) 30 lb
D) 360 lb
E) 36 lb