rounding - PHP auto convert price to 99 rather than 100 -

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i have different prices:

100 550 799 1200 350

wonder how can automatically convert them 

99 549 799 1200 349

i'd -1, correct 799, , don't want 798.

cant think of way conversion php not great math. bet need find if divides 2 if yes subtract 1 if not nothing.

if ($price % 2) {    $price = intval($price) - 1; }

is best way it?

something this?

if(($price % 10) == 0) {     $price--; }

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