What is the best way to calculate values from an SQL Server Database in Blazor Server?

Question

 public class Loan
    {
        [Key]
        public int LoanId { get; set; }
        public string LoanNumber { get; set; }
        public int TotalAmount { get; set; }
        public int PaidAmount { get; set; }
        public DateTime DueDate { get; set; }
        public int GroupId { get; set; }
        public Group Group { get; set; }

    }

I want to be able to calculate the balance given by: Balance = TotalAmount-PaidAmount I also want to be able to see the result in my web application. Refer to the picture attached.