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x : precio inicial de una lancha.
Solución:
x - 20x/100 = $80 000
(100x - 20x)/100 = $80 000
80x/100 = $80 000
80x = $80 000 × 100
80x = $8 000 000
x = $80 000 000/80
x = $100 000 -------->>> Precio inicial de una lancha.
RTA: El precio inicial de una lancha es de $100 000.
$80000 ---------->80%
x --------------------100%
x = $80.000 * 100% / 80%
x= $80.000 * 1,25
x = $100.000 se vendia inicialmente la lancha
saludos desde venezuela