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75% = 75/100 = 0.75
c+z = 126 ec. 1
c+0.14c = 0.75z ec. 2
De la ec. 1:
c = 126-z ec. 3
De la ec. 2:
1.14 c = 0.75z
c = z*0.75/1.14
c = z*0.658 ec. 4
Sustituyendo valores de la ec. 3 en la ec. 4:
126-z = z*0.658
126 = z + (z*0.658)
126 = z*1.658
z = 126/1.658
z = 76
De la ec. 3:
c = 126-z
c = 126-76
c = 50
Comprobémoslo en la ec. 2:
c+0.14c = 0.75z
50+(50*0.14) = 0.75*76
50+7 = 57 comprobado.
Por tanto se pagó por cada articulo:
Chompa: $50
Zapatos: $76
Saludos..........