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4000×20/100= 800
4000-800= 3200
4000+800= 4800
→la compro en 3200 (precio del costo)
→la vendio en 4800
3200---100%
4800----x$
x= 4800×100/3200
x=480000/3200
x= 150%
150%-100%= 50%
R= Gane el 50%