Answer
$12.5^{\circ}$
Work Step by Step
$12^{\circ}30'=12^{\circ}+\frac{30}{60}^{\circ}$ (use $1'=\frac{1}{60}^{\circ}$)
$=12^{\circ}+0.5^{\circ}=12.5^{\circ}$
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