Ruby on Rails

I try with this:

class Auto

attr_accessor :auto

def initialize(auto)
@modelo = modelo
@precio = precio

end

def calcular_neto(i)
for i in 0 ..i
(auto)*0.18
end
return auto

end

auto = Auto.new("Volvo", 19000)
neto = auto.calcular_neto(2)
puts " Neto: #{neto}"

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