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Cât face? 15%din39
40%din1000
2,1%din400
145%idn90.


Răspuns :

15/100*39=585/100=5,85
40/100*1000=400
145/100*90=1305/10=130,5
21/10/100*400=21/10*1/100*400=21/1000*400=84/10=8,4