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aumento de 50% ==> 100+50%(100)=100+(50/100*100)=100+50=150
descuento de 20% ==> 150-20%(150)=150-(20/100*150)=150-30=140
descuewnto de 30% ==> 140-30%(140)=140-(30/100*140)=140-42=98
teniamos 100 y al final nos quedo 98
entoces has disminuido 100-98=2
rpta ==> 2 %