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5- x%
12*x=5*100
12x=500 / :12
x=41,66% czyli w przybliżeniu 42%
2. 95 - 100%
x - 10%
x*100 = 10*95
100x=950 / :100
x = 9,50 zł
95zł-9.50zł = 85.50 zł -->nowa cena butów
3. 12 - 100%
x - 8%
x*100%=12*8%
100x=96 / : 100
x= 0.96