public double MonthlyInterest()
{
var loan = _loanRepository.GetLoan();
var roundDecimals = 10;
// rate of interest and number of payments for monthly payments
double rateOfInterest = Math.Round(loan.AnnualInterestRatePercentage / 1200, roundDecimals);
double numberOfPayments = loan.Duration * 12;
// loan amount = (interest rate * loan amount) / (1 - (1 + interest rate)^(number of payments * -1))
return(Math.Round((rateOfInterest * loan.Amount) / (1 - Math.Round(Math.Pow(1 + rateOfInterest, numberOfPayments * -1), roundDecimals)), roundDecimals));
}
public double OneTimeAdministrationFee()
{
var loan = _loanRepository.GetLoan();
var fee = _feesRepository.GetFeesConfig();
var percentageFee = fee.OneTimeFeePercetange * loan.Amount / 100;
return(percentageFee <= fee.OneTimeFeeAmount ? percentageFee : fee.OneTimeFeeAmount);
}