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Descuento total = dt
d₁ = 20
d₂ = 20
dt = [d₁ + d₂ - (d₁ * d₂)/100]%
dt = [ 20 + 20 - (20 * 20)/100]%
dt = [ 40 - 400/100]%
dt = [40 - 4]%
dt = 36%
Respuesta.
El descuento total es del 36%