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Valor pulsera = x
x - 40% *x = 12
x - 40/100 *x = 12
x - 40x/100 = 12
100x/100 - 40x/100 = 12
(100x - 40x)/100 = 12
60x/100 = 12
60x = 12 *100
60x = 1200
x = 1200/60
x = 20
Respuesta.
El precio real de la pulsera es de s/. 20
(X - 40%) = 12
60%X = 12
0,6X =12
X = 12/0,6
X = 20