helper to turn $5,758,937 into $5M

fmt_stat (helper)

    def fmt_stat(stat, prefix = "$")
      stat = case stat
        when -999999999999..-10000 then number_to_human(stat, :units => {:million => "M", :thousand => "K", :billion => "B"}).gsub(/ /,'')
        when -9999..9999           then number_with_delimiter(stat)
        when 10000..999999999999   then number_to_human(stat, :units => {:million => "M", :thousand => "K", :billion => "B"}).gsub(/ /,'')
        when nil then number_with_delimiter(0)
        else stat
      end
      stat = stat === "N/A" ? stat : "#{prefix}#{stat}"
    end