2000zl-100%
1740-x=87%
2000x-174000
x=87%
100%-87%=13%
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1740zł---------x procent
__________________
X= 1740*100=174000
174000:2000= 174:2=87procent
100-87= 13procent.
odp. cenę obniżono o 13procent.
2000zl-100%
1740-x=87%
2000x-174000
x=87%
100%-87%=13%