Chuck Savage
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 May 31 comment Algebra equation for percentage increase needed to get the current value as a 20% discount thanks for writing this all out, it was easy to follow. Also completely different from Jonas approach, but with the same answer. Reviewing his equation, his is the same as yours except = 1 and not 100. May 31 comment Algebra equation for percentage increase needed to get the current value as a 20% discount Actually, I'm thinking of setting up my website so independent sales people can sell my products, and their customers enter a code that gives them a 20% discount but then I also know who's code it is and they get their commission. So, their customers get the actual price and someone that doesn't use the sales code gets jacked (the 25% increase we figured out below), aka I'm not undercutting the sales people. May 31 comment Algebra equation for percentage increase needed to get the current value as a 20% discount @Tony Yes, I'm aware this was an algebra question and not a calculus one. As it being linear algebra, I couldn't remember if it was. May 31 comment Algebra equation for percentage increase needed to get the current value as a 20% discount @Jonas ty again, I worked through it on my own and came up with the same. These exchanges are great! If you ever have C#/asp.net coding questions head over to stackoverflow.com and I'd be happy to answer them! May 31 comment Algebra equation for percentage increase needed to get the current value as a 20% discount @Jones ty for dumbing it down, @Tony no I don't have kids. I'm not dumb, just haven't thought in equations for a long time. I've forgotten all my calculus. I probably couldn't do an integral to save my life now. May 31 comment Algebra equation for percentage increase needed to get the current value as a 20% discount Yes - thank you. How do you write those equations... I came up for X = ((1/(1-20/100)-1)*100) and my math is so rusty, I don't know what to do with that right side to reduce it. May 31 comment Algebra equation for percentage increase needed to get the current value as a 20% discount I'm reading over it trying to figure it out. How come it isn't A^2 in the first equation, since you had an A for both the plus and the minus?