Please show the work, the answer I keep getting is wrong.

Of an initial amount of $7000$ g of lead$-210,$ how much will remain in $160$ years? Lead$-210$ decays at a rate of $3\mathrm{.}15\frac{\%}{y}r.$

$41\mathrm{.}8$ g

$($Round to one decimal place as needed.$)$

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