@TheDefend Exactly, he applied 25% discount rather than 20%.. Hopefully It is just a mistake on the translation's part, specially since It really is very basic math. LOL
@TheDefend it basically like this, he sell for 100 that turns into 80 yen for profit, and for discounted 20% off 100 is 80 yen, 80 yen - 20 yen is 60 yen