gia ban la 100
gia lai la 25% gia von
gia von la 100-25=75
gia lai la 75*25%=18.75
gia lai bang so phan tram gia ban la 18,75/100*100=18,75%
gia ban la 100
gia lai la 25% gia von
gia von la 100-25=75
gia lai la 75*25%=18.75
gia lai bang so phan tram gia ban la 18,75/100*100=18,75%
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