<?php $p = 0; $i = 0.06; $c = 12; $n = 1; $r = 200; $x = $i / $c; $y = pow((1 + $x), ($n * $c)); $vf = $p * $y + (($r * $y - 1) / $x); // your original equation echo $vf; echo "\n\n"; $vf = $p * $y + ($r * ($y - 1) / $x); // correct equation echo $vf;
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