回答編集履歴
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追記
test
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@@ -1 +1,63 @@
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本質は算数の問題だと思うよ。。。
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```php
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<?php
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$bunsi = 1;
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$bunbo = 2;
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echo $bunsi/$bunbo;
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echo PHP_EOL;
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$percentage = sprintf('%.2f',100-$bunsi/$bunbo);
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echo $percentage;
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echo PHP_EOL;
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//0.5
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//99.50
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echo $bunsi*100/$bunbo;
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echo PHP_EOL;
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$percentage = sprintf('%.2f',100-$bunsi*100/$bunbo);
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echo $percentage;
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echo PHP_EOL;
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//50
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//50.00
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$bunsi = 1;
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$bunbo = 3;
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echo $bunsi*100/$bunbo;
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echo PHP_EOL;
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$percentage = sprintf('%.2f',100-$bunsi*100/$bunbo);
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echo $percentage;
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//33.333333333333
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//66.67
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63
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```
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