I am having trouble setting up an equation for a specific type of percent problem. Here is an example to help clarify.
Keith wants to mark all of the original prices in his store down to half off. The prices are already marked down by 20%. What additional percent should be discounted?
An explanation would be greatly appreciated. Thanks in advance
An item that used to list at $\$100$ now sells for $\$80$ (that's the $20\%$ discounted price). How much should you discount that $\$80$ to make the price $\$50$?