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richkilmer/gist:189302

Forked from mattetti/gist:189283
Created September 18, 2009 21:24
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gistfile1.rb
def summer_monthly_usage
@summer_monthly_usage ||= monthly_usage_summary(rates.summer_months_nbr)
end
private
def monthly_usage_summary(months)
months.inject(0) { |sum, m| sum + monthly_usage[m - 1] }
end
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