Nike sells hoodies for 100% markup the store owner bought them for $4 then put it on sale for 25% off what is the sale price

6$

First the owner buys the sweatshirt for 4$.  Then it gets marked up by 100% which is just doubling it making it $8.  After that you get 25% of 8 which is 6 cause 0.25*8 is 2, so you subtract 2 from the original answer to get 6 dollars as the sale price.

true? is that what you're asking or do you mean something else?