public ProductPrice GetProductPrice(DateTime date)
{
return(ProductPrices
.Where(pp => pp.Date <= date)
.OrderBy(pp => pp.Date)
.LastOrDefault());
}
public decimal GetProductProfit(DateTime date)
{
var p = ProductPrices
.Where(pp => pp.Date <= date)
.OrderBy(pp => pp.Date)
.LastOrDefault();
return(p.SellingPrice - p.PurchasePrice);
}
private decimal PriceOf(RentedProduct rentedProduct)
{
return(ProductPrices.Where(price => price.ProductId == rentedProduct.ProductId)
.Single().UnitRentPrice.Value);
}