(3000 zł*p)+(4000zł*(p+2%))=360zł
3000pzł+80zł+4000pzł=360zł
3000pzł+4000pzł=280zł
7000pzł=280zł
p=280zł/7000zł
p=0,04
p=4%
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(3000 zł*p)+(4000zł*(p+2%))=360zł
3000pzł+80zł+4000pzł=360zł
3000pzł+4000pzł=280zł
7000pzł=280zł
p=280zł/7000zł
p=0,04
p=4%