public static LoanSummary GetLoanSummary(decimal loanAmount, decimal apr, int numberOfPayments)
{
//get periodical payment amount
decimal payment = Math.Round(Loans.LoanCalcs.CalculatePayment(loanAmount, apr, numberOfPayments), 2);
var loanAdjustments = LoanAdjustment.GetLoanAdjustment(loanAmount, numberOfPayments, payment);
var ls = new LoanSummary()
{
weeklyRepayment = payment, totalRepaid = loanAdjustments.totalToPay, totalInterest = loanAdjustments.totalInterest
};
return(ls);
}
public static LoanAdjustment GetLoanAdjustment(decimal loanAmount, decimal numberOfPayments, decimal payment)
{
var la = new LoanAdjustment();
la.totalToPay = Math.Round((payment * numberOfPayments), 2);
la.totalInterest = Math.Round(la.totalToPay - loanAmount, 2);
/* Do adjustments to cater for rounding 'errors'
* Typically the first payment on any loan/DD schedule is slightly different to future payments
*/
la.loanInstallment = Math.Round((decimal)loanAmount / (decimal)numberOfPayments, 2);
la.loanAdjustment = loanAmount - (la.loanInstallment * numberOfPayments);
la.interestInstallment = Math.Round(la.totalInterest / numberOfPayments, 2);
la.interestAdjustment = (loanAmount + (la.interestInstallment * numberOfPayments)) - la.totalToPay;
la.adjustedLoanAmount = la.totalToPay - la.loanAdjustment;
la.adjustedInterestAmount = la.totalInterest - la.interestAdjustment;
return(la);
}
public static LoanRepaymentSchedule GetRepaymentSchedule(decimal loanAmount, decimal apr, int numberOfPayments)
{
var lrs = new LoanRepaymentSchedule();
//get periodical payment amount
decimal payment = Math.Round(Loans.LoanCalcs.CalculatePayment(loanAmount, apr, numberOfPayments), 2);
///* Do adjustments to cater for rounding 'errors'
// Typically the first payment on any loan/DD schedule is slightly different to future payments
// */
var loanAdjustments = LoanAdjustment.GetLoanAdjustment(loanAmount, numberOfPayments, payment);
decimal principalStillToPay = loanAdjustments.loanInstallment * numberOfPayments;
for (int i = 1; i <= numberOfPayments; i++)
{
if (i == 1)
{
loanAdjustments.interestInstallment -= loanAdjustments.interestAdjustment;
principalStillToPay += loanAdjustments.loanAdjustment;
}
lrs.installments.Add(new Installment
{
installmentNumber = i,
amountDue = loanAdjustments.totalToPay,
principal = principalStillToPay,
interest = loanAdjustments.interestInstallment
});
loanAdjustments.totalToPay -= payment;
principalStillToPay -= loanAdjustments.loanInstallment;
}
return(lrs);
}