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500-15=485
485*20przez100=9700/100=97
485-97=388
x-97%
100x=500*97
100x=48500/:100
x=485-cena po obniżce o 3%
485-100%
x-80%
100x=485*80
100x=38800/:100
x=388-cena po kolejnej obniżce
3%z 500=15zl
500-15=485zl
20%z 485zl=97zl
485zl-97zl=388zl
Material po dwoch obnizkach kosztowal 388zl.