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90*14=1260
1540*20%=1540*20/100=308
1540-308=1232
110 bluzek- 1232 zł
90 bluzek -1260 zł
Za 110 bluzek: 110*14zl=1540
1540zl-------100%
xzl-----------80% (bo 100%-20%)
--------------------
x=(1540*80)/100
x=1232zl