If $A$ and $B$ are two independent events such that $P(B)=\frac{2}{7}$ and $P(A \cup B^c)=0.8$, then $P(A)$ is equal to:

  • A
    $0.1$
  • B
    $0.2$
  • C
    $0.3$
  • D
    $0.4$

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