Events $A, B, C$ are such that $P(A) = 0.5$, $P(B) = 0.4$, $P(C) = 0.3$. If $A, B$ are independent, $B, C$ are independent, and $A, C$ are independent, and $P(A \cap B \cap C) = 0.03$, what is $P(A \cup B \cup C)$?