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ELLIOTTCABLE/gist:189288

Forked from mattetti/gist:189283
Created September 18, 2009 20:57
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gistfile1.rb
def summer_monthly_usage
@summer_monthly_usage ||= rates.summer_months_nbr.map{|month| monthly_usage[month - 1]}.inject(0){|sum, v| sum += v}
end
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