Solve the Problem $P ( A ) = 0.39 , P ( B ) = 0.36$

Multiple Choice

Solve the problem.
-Suppose that $P ( A ) = 0.39 , P ( B ) = 0.36$ , and $P ( A \cap B ) = 0.21$ , find $P ( A \cup B )$ .

A) $0.54$
B) $0.75$
C) $0.33$
D) $0.96$