Quick math question

[deleted738762]

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How do you figure 200$ profit in the explanation. Before it was 100$, now it jumped to 200$.. how and why does that happen if he only lost 20% of stickers. Thanks

 

[FutureDDS_11]

He wants to make a 100% profit, which means that the profit he makes = 100$. So He adds that profit margin to the cost 100+100 = $200 : how much he will sell them for.
He lost 20% of his stickers, leaving him with 800 stickers.
price per sticker = total price he wants to sell them for / number of stickers = 200 / 800 = 0.25$ per sticker