public void Run() { //output vehicleTypes using Display method foreach (var vehicleType in types) { vehicleType.Display(); } //select last item and assign some value var lastVehicleType = types.Last(); lastVehicleType.TaxCoefficient = 1.3m; //select max and average tax coefficients var maxTaxCoefficient = types.Max(type => type.TaxCoefficient); var averageCoefficient = types.Average(type => type.TaxCoefficient); //show max and average coefficients Console.WriteLine($"max type coefficient: {maxTaxCoefficient}, average type coefficient {averageCoefficient}"); //show vehicleTypes using ToString method OutputService.PrintCollection(types); }