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<?php function checkNum($num){ $commission1 = 5; $commission2 = 7; //echo ($num - $num*$commission1/100 - $num*$commission2/100); //echo '|'; //echo (($num - $num*$commission1/100 - $num*$commission2/100) % 10); //echo '||'; //echo fmod(($num - $num*$commission1/100 - $num*$commission2/100), 10); //echo '||'; return fmod(($num - $num*$commission1/100 - $num*$commission2/100), 10) == 0; } function getMaxValidSum($sum){ for ($i=$sum; $i>0; $i--){ if (checkNum($i)) { return $i; } } print("Недостаточно средств для списания."); } print(getMaxValidSum(983));
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