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2,8 zł - x % [2,8 po dodaniu 30 gr]
100 % razy 2,8 zł : 2,5 zł = 280 : 2,5 = 112 %
112%-100%=12%
Odp. Benzyna zdrożała o 12%.
2,5 - x%
2,8*x =2,5 *100
2,8*x =2500
x= 2500/2,8
x=89%
100%- 89%= 11%
:)
30gr.=x%
x%=30*100/250
x%=12