class Faker::Company

def abn_checksum(abn) 

def abn_checksum(abn)
  abn_weights = [10, 1, 3, 5, 7, 9, 11, 13, 15, 17, 19]
  sum = 0
  abn_weights.each_with_index do |weight, i|
    sum += weight * abn[i].to_i
  end
  sum
end