Question 802
the other answer is so badly wrong, i cannot believe it!

Let x = original price.

The long way (and safest way) is as follows:

Find what 20% of the original is.
Subtract this from the original
that answer is equal to 12590

so...what is 20% of x?...answer is (20/100)*x which is 0.2x

original minus the 20% discount is (x - 0.2x) which is 0.8x and this is equal to the price of $12590

so 0.8x = 12590 --line A
therefore x = 12590/0.8
x = 15737.50

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Quick method.... a % reduction is less than 1 at line A...10% reduction would be 0.9, 25% reduction would be 0.75 etc

An increase would therefore be greater than 1, eg 10% increase is 1.10. 3% increase is 1.03 (NOT 1.3)
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jon