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Calculamos:
20/100 del 5/100 de A = 8
(20 * 5 * A) / (100 * 100) = 8
100A / 10 000 = 8
100A = 10 000 (8)
100A = 80 000
A = 80 000/100
A = 800
El valor de A es = 800
Ahora:
hallar el 12% de 2A
Como A = 800, entonces:
El 12% de 2A =
12% de 2 (800)
12% de 1600
(12 * 1600)/100
19200/100
192
Respuesta.
El 12% de 2A es = 192