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The percent error is basically the fractional deviation from the accepted value.
The percent error is the absolute difference between the measured/approximate and accepted/exact values, relative to the exact value:
$\mathbf(% "Error" = |"Approximate" - "Exact"|/("Exact")xx100%)$
$= |82 - 80|/(80)xx100%$
$= color(blue)(2.5%)$
So the percent error is
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