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580=x
600x=58000
x=96,7%
100%-96,7%=3,3%
Odp. O 3,3%
29/30*100=9 2/3 %
580-x%
x%=580*100%/600
x%-=580%/6
x%=96,6%
100%-96,6%=3,4%
cenę obniżył o 3,4%