Question 11855: IT's me again...I certainly appreciate all the help and assistance. You folks are great! Could someone please help me work out a faily simple problem:
Find the original price if there is a 15% discount and the sale price is $255.
i think the formula in my book states: "Selling price = list price - amount of discount?" I know it's easu but I can't seem to get the $300 for the answer, in the book.
Thanks everyone!
Answer by longjonsilver(2297)   (Show Source):
You can put this solution on YOUR website! forget the formula... you will never truly understand problems just by using formulae in questions like this. Learn what you "need" to do, then it makes sense.
Remeber too, any percentage is ALWAYS calcualted on the ORIGINAL, so DO NOT do anything directly with the 15% and the 255!
... this is the approach:
--> Let original price = x, then
1. Find 15% of original
2. we take the 15% off the original
3. this then equals 255.
ok...
1. 15% of original
(15/100)*x --> 0.15x
--> can you see the match between "15% of x" and "0.15x"?
2. take this off the original
x - 0.15x
0.85x
--> now can you see the link between "take 15% off" and "0.85x"... this is the skill to learn :-)
eg take 3% off...would be 0.97x...can you see that?
eg add 3% on...would be 1.03x etc.
3. equals 255
0.85x = 255
--> x = 255/0.85
x = 300
there you go :-)
jon.
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