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Costo original = x
ganancia = 20% de x, es decir x/5 (el 20 es igual a la quinta parte)
Entonces
1.44 = x + x/5
1.44 = (5x+x)/5
5(1.44) = 6x
7.2 = 6x
x = 1.2
El precio original del libro era 1.2