code: def append_overhead_costs(costs, new_id, overhead_percentage=0.15):
      
      total_time = 0
      for item in costs:
          total_time += item['time']
  
      costs.append({
          'id': new_id,
          'task': 'Overhead, Bufixes & Iterations',
          'time': total_time * overhead_percentage, },
      )
      return costs
docs: Adds 15% overhead costs to the list of costs.
  
      Usage::
  
          from rapid_prototyping.context.utils import append_overhead_costs
          costs = [
              ....
          ]
          costs = append_overhead_costs(costs, MAIN_ID + get_counter(counter)[0])
  
      :param costs: Your final list of costs.
      :param new_id: The id that this new item should get.