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d₁ = 20
d₂ = 40
Formula.
Descuento total(dt) = [d₁+d₂ - d₁*d₂/100]%
dt = [20 + 40 - 20*40/100]%
dt = [60 - 800/100]%
dt = [60 - 8]%
dt = 52%
Respuesta.
El descuentofinal es del 52%