SOLUTION: What formula do I use to find the original price of something? I know the final amount and the percentage added. Example: the final amount is $100.00. The percentage added is 20%.

Algebra ->  Percentage-and-ratio-word-problems -> SOLUTION: What formula do I use to find the original price of something? I know the final amount and the percentage added. Example: the final amount is $100.00. The percentage added is 20%.       Log On


   

Question 448584: What formula do I use to find the original price of something? I know the final amount and the percentage added. Example: the final amount is $100.00. The percentage added is 20%. What is the original amount without the 20% added?
Answer by nerdybill(7384) About Me  (Show Source):
You can put this solution on YOUR website!
What formula do I use to find the original price of something? I know the final amount and the percentage added. Example: the final amount is $100.00. The percentage added is 20%. What is the original amount without the 20% added?
Let x = original price
then
x + .20x = 100
x(1+.20) = 100
1.20x = 100
x = 100/1.20 (this is what you're looking for)
x = $83.33
replace the 100 with whatever other "final amount" and you'll see the original price