DENOMINATIONS.each_pair do |f, k|
    define_method("end_#{f}") {send("begin_#{f}") - k - send("business_day.spent_#{f}") - send("business_day.safe_balance.#{f}_deposits") + send("business_day.register_new_#{f}") + send("business_day.safe_balance.#{f}_withdrawals") }
  end