Answer
$4.341\%$
Work Step by Step
Use the formula for compounding daily for 1 year with $r=0.0425,n=365$, we have
$A(1)=P(1+\frac{0.0425}{365})^{365\times1}=1.0434P$, thus we can get the APY as
$APY=\frac{A(1)-P}{P}=4.341\%$
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