Can someone help a forgetful old man out?

I know the solution is simple but for the life of me cannot remember it's been so long since I actually thought about it. Internet searches insist on telling me the price after 20% is taken off which is the exact opposite of my question so I'm here to ask you good folks. I'm trying to remember the formula to get the original price of lets use an items sale price is $140 after 20% off. Can someone show me the work on how to get back to the original price? I would appreciate it.

Lord Bacon2020-10-18T10:34:23Z

Favorite Answer

If it costs $140 after 20% has been taken off, then $140 is 80% of the original price.
If you divide $140 by 80 and then multiply the answer by 100, that will tell you the original price. I make it $175.