Answer
$303580.52$
Work Step by Step
We have $A=P(1+\dfrac{r}{n})^{nt} $
Re-write as: $P=A(1+\dfrac{r}{n})^{-nt} $
Plug in the given values:
$P=500000(1+\dfrac{0.05}{12})^{-(12)(10)} \approx 303580.52$
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