This is an additional post. Actually, I am very familiar with this topic(finding original prices of things), except that I posted some things that I don't understand or wanted to post. But I thought that other people who would visit my blog might not understand about this, therefore, I posted this one.
Question: A toy costs $4 after a 20% discount. Find its original price.
Solution:
100%-20%=80%
$4 => 80%
100% => $4/80 x 100 = $5
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