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9/10- 90%
18,30zł-100%
130%-x
100%-18,30
x= 130*18,30:100=23,79 zł- tyle zapłacą
4/10 * 18zł30gr = 7zl 32gr
18zl30gr-7zl32gr=10zl98gr
1/10*18zl30gr=1zl83gr
18zl30gr-1zl83gr=16zl47gr
10zl98gr+16zl47gr=27zl45gr