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640 - 40 %
x - 100%
x= 1600 zł
2.
320 - 100%
52 - x%
x=16,25 procent
640zł - 40%
x - 100%
6400 - 40x
x=160zł < - całkowity koszt
2.
320 - 52 = 168
320 - 100 %
168 - x
16800 - 320x
1680 - 32x
x=52,5 <-- to ten procent .
Nie jestem pewny ale chyba tak . ; )