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total = 80
El 20% de 80
80.........100%
x.............20%
80*20=100x
1600/100=x
x= 16
80-16= 64 es lo que quedó
ahora el 15% del resto
64...........100%
x................15%
64*15=100x
960/100=x
x= 9.6
64-9.6=54.40
lo que quedó 54.40