private decimal GeneralEquation(int period, decimal payment, decimal initialPeriods, decimal fractions, decimal rate)
{
decimal retval = 0;
for (int x = 0; x < period; x++)
{
retval += payment / ((1.0M + fractions * rate) * DecimalUtils.Pow(1 + rate, initialPeriods + x));
}
return(retval);
}
private IEnumerable <AmortizationItem> GetPaymentStream()
{
var balance = LoanAmount;
var monthlyPayment = RecurrentPayment();
var additionPpal = _loanObj.ExtraPayment;
int totalNumOfPayments = LoanTerm;
for (int i = 0; i < totalNumOfPayments; i++)
{
if (balance > 0)
{
decimal interestForMonth = balance * RatePerPayment;
var principalForMonth = monthlyPayment - (interestForMonth);
balance -= (principalForMonth + additionPpal);
AmortizationItem item = new AmortizationItem
{
MonthNro = i + 1,
Interest = DecimalUtils.RoundDecimalUp(interestForMonth),
Principal = DecimalUtils.RoundDecimalUp(principalForMonth),
Balance = DecimalUtils.RoundDecimalUp(balance),
PMI = DecimalUtils.RoundDecimalUp(PeriodPMI),
Taxes = DecimalUtils.RoundDecimalUp(PeriodTaxes),
ExtraPayment = additionPpal
};
yield return(item);
}
else
{
yield break;
}
}
}
private decimal DefaultPaymentCalc()
{
decimal payment = (LoanAmount) * (DecimalUtils.Pow((1 + RatePerPayment), LoanTerm) * InterestRate) / (12 * (DecimalUtils.Pow((1 + RatePerPayment), LoanTerm) - 1));
return(payment);
}