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Regla de tres simple
a)
200----100%
16---------x
a) x= (16×100)/200= 1600/200= 8℅
b) x= (60×100)/300= 6000/300= 20%
c) x= (120×100)/400= 12000/400= 30%
d) x= (160×100)/200= 16000/200= 80%
e) x= (250×100)/500= 25000/500= 50%
f) x= (75×100)/300= 7500/100= 75%