If $\vec { v }$ = 4 $\bar { P }$ = 3%, And

Multiple Choice

If $\vec { v }$ = 4%, $\bar { P }$
= 3%, and $\bar { Y } _ { R }$
= 2%, then $\bar { M }$
Must equal:

A) 1%.
B) 2%.
C) 6%.
D) 7%.