Odd math behavior?

[kc8oye]

i have this code

if ($debug) {
    echo "Labor Amt: $lbrAmt<br> PArts total: $pTotal <br> Pay Total: $payTotal<br>\r\n";
}   
    $invBal = ($lbrAmt + $pTotal) - $payTotal;
    ?>
    <table><tr><th>Labor: </th><td><?=$lbrAmt?></td></tr>
    <tr><th>Parts:</th><td><?=$pTotal?></td></tr>
    <tr><th>Payments:</th><td><?=$payTotal?></td></tr>
    <tr><th>Balance:</th><td><?=$invBal?></td></tr></table>

that produces this output

Labor Amt: 96.25
PArts total: 109.08
Pay Total: 205.33

Labor:	96.25
Parts:	109.08
Payments:	205.33
Balance:	-2.8421709430404E-14

why is simple 2 decimal place math generating an answer of 0.0000000000002 ?

 

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