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kirby007 said:
The thing is if i work woth + and -
+20% +20% -20% sum becomes 20% off
Yes there might be ways to avoid that but this is sinplistic

It might be simplistic but its 100% wrong

+20% +20% -20% = 20% off, 20% off, 20% off = average of 20% error

To easily prove what you're saying is nonsense think of

sales ps4 1000 switch 1000 xb1 1000

person 1 guessed 500, 2000, 500

person 2 guessed 1000,1001,1000

you're claiming person 1 is more accurate than person 2