public async Task <Order> Calc(Order order)
{
decimal totalTax = await taxCalculator.CalcTaxAsyn(order);
decimal total = 0;
if (order.Items.Count > 0)
{
total = order.Items.Select(a => a.Price * a.Quantity).Sum();
}
total += totalTax;
order.Total = total;
order.TotaTax = totalTax;
return(order);
}
