If $\alpha$ = 40 $\degree$ And the Tension in String 2 Is 30 N,determine M

If $\alpha$ = 40 $\degree$ and the tension in string 2 is 30 N,determine M.

A) 3.4 kg
B) 3.6 kg
C) 2.6 kg
D) 4.9 kg
E) 7.5 kg