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a)5247
b)1449
c)1585
2)
MCMLXVII
DXCV
CCCIX
4)
100%-30%=70%
70%*90ZŁ=70%/100%*90ZŁ=63złpo obnizce
5)
100%+15%=115%
115%*18zł=115%/100%*18zł=20,70zł podrozał bilet
6)100%-10%=90%
90%*270zł=90%/100%*270zł=243zł