#問題文
1以上10N以下の整数のうち7の倍数の割合を求めよ。
#ソース
<?php
//入力値
$nyu = "4";
//乗算対象数値
$ten = 10;
//乗算
$jyo = pow($ten,$nyu);
//7を割る 小数点は切り上げ
$total = $jyo / 7;
$total = floor($total);
//7の倍数の割合計算
$kekka = $total / $jyo;
echo $kekka;
?>
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