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class Currency

  MAPPINGS = { "GBP" => "£", "EUR" => "€",
    "USD" => "$", "AUD" => "$", "CAD" => "$" }
  
  def initialize(curr)
    # default to USD if we're passed in nil for some reason
    @curr=curr || "USD"
  end
  
  def prefix
    MAPPINGS[@curr] || "#{@curr} "
  end
  
end