evaluate.rb

class Evaluate
  def call(input_data, bank)
    initial_data = input_data.merge(bank.parameters)
    steps = bank.evaluation_steps
    
    steps.inject(initial_data) do |data, (result_name, calculate_result)|
      data.merge({ result_name.to_sym => calculate_result.(data) })
    end
  end
end

# call it
Evaluate.new.(RAW_INPUT, BankA.new)