table = [{res: -155721, kd: 1, tds: -155721, tdsn: -155721},
         {res: 148893, kd: nil, tds: nil, tdsn: nil},
         {res: 148893, kd: nil, tds: nil, tdsn: nil},
         {res: 238339, kd: nil, tds: nil, tdsn: nil},
         {res: 238339, kd: nil, tds: nil, tdsn: nil},
  ]
e = 0.8
4.times do |i|
  table[i+1][:kd] = (1/(1+e)**(i+1)).round(4)
  table[i+1][:tds] = (table[i+1][:kd]*table[i+1][:res]).round
  table[i+1][:tdsn] = (table[i][:tdsn]+table[i+1][:tds]).round
end
table.each do |i|
  i.each {|k,v| print v.to_s+"      "}
  print "\n"
end

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