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x - 107%
x= 4*107/100
x=4,28
b)15,45-100%
x - 97%
x=15,45*97/100
x=w przybliżeniu 14,99zł.
15,45-14,99=0,46zł
c18,30zł.- 100%
x- 935
x=18,30*93/100
x=17,01
18,30-17,01=1,29