PrintOrderCostCalculationService.cs

public class PrintOrderCostCalculationService : IPrintOrderCostCalculationService
{
    private readonly IEnumerable<IExpensesCalculator> _expensesCalculators;
    public PrintOrderCostCalculationService(IEnumerable<IExpensesCalculator> expensesCalculators)
    {
        _expensesCalculators = expensesCalculators;
    }
	
    public double Calculate(PrintOrder order)
    {
       return _expensesCalculators.Sum(x => x.Calculate(order));
    }
}