#### Answer

$47.2\%$

#### Work Step by Step

RECALL:
$R=\dfrac{P}{B}$ where $P$=part or amount (percentage), $B$=base, and $R$=rate
The given problem has:
$B= 125$ pounds
$P= 59$
Use the formula above to find the percent of fish usable as fillets:
$=\dfrac{59}{125}
\\=0.472
\\=0.472 \times 100\%
\\=47.2\%$