Late bound plugin run on multiple entities

CalculateTotalAmountLateBoundPlugin.cs

public class CalculateTotalAmountLateBoundPlugin : IPlugin
{
    public void Execute(IServiceProvider serviceProvider)
    {
        var context = serviceProvider.GetService(typeof(IPluginExecutionContext)) as IPluginExecutionContext;
        var serviceFactory = serviceProvider.GetService(typeof(IOrganizationServiceFactory)) as IOrganizationServiceFactory;
        var service = serviceFactory.CreateOrganizationService(context.UserId);

        var lateBoundEntity = context.InputParameters["Target"] as Entity;
        lateBoundEntity["new_totalsum"] = lateBoundEntity.GetAttributeValue<decimal>("new_netamount") + lateBoundEntity.GetAttributeValue<decimal>("new_margin");
    }
}