public double?CalculateVatRate() { if (PriceWithVat.IsNullOrDefault() || Price.IsNullOrDefault()) { return(null); } return((PriceWithVat / Price) * 100 - 100); }
public double?CalculatePrice() { if (PriceWithVat.IsNullOrDefault() || VatRate.IsNullOrDefault()) { return(null); } return(PriceWithVat / ((VatRate + 100) / 100)); }