private decimal CalculateEmi(CalculateLoanRequest request)
{
var p = request.LoanAmount;
var r = request.InterestRate / (12 * 100); // one month interest
var n = request.NumberOfYears * 12; // one month period
var emi = p * r * (decimal)Math.Pow((double)(1 + r), n)
/ (decimal)(Math.Pow((double)(1 + r), n) - 1);
return(emi);
}
public Response <CalculateAllInterestData> CalculateAllInterestData(CalculateLoanRequest request)
{
var response = new Response <CalculateAllInterestData>
{
Result = new CalculateAllInterestData
{
InterestData = new List <InterestData>()
}
};
try
{
var monthlyRateOfInterest =
request.InterestRate / (12 * 100); // one month interest
var closing = request.LoanAmount;
var opening = request.LoanAmount;
decimal cumulativeInterest = 0;
var installment = 1;
while (Math.Round(closing) > 0)
{
var interest = opening * monthlyRateOfInterest;
var emi = CalculateEmi(request);
var principal = emi - interest;
closing = opening - principal;
cumulativeInterest = cumulativeInterest + interest;
var obj = new InterestData
{
Opening = Math.Round(opening, 2),
Closing = closing < 0 ? 0 : Math.Round(closing, 2),
Emi = Math.Round(emi, 2),
CumulativeInterest = Math.Round(cumulativeInterest, 2),
Installment = installment,
Interest = Math.Round(interest, 2),
Principal = Math.Round(principal, 2)
};
response.Result.InterestData.Add(obj);
opening = closing;
installment += 1;
}
}
catch (Exception ex)
{
// handle exception
response.StateModel.SetErrorMessage(AppMessageConstants.SystemError,
(int)AppEnum.ResponseStatusCode.WrongOperation);
}
return(response);
}
public Response <CalculateLoanResponse> CalculateLoan(CalculateLoanRequest request)
{
var response = new Response <CalculateLoanResponse>
{
Result = new CalculateLoanResponse()
};
try
{
response.Result.Emi = CalculateEmi(request);
response.StateModel.SetSuccessMessage(AppMessageConstants.ResultSuccess,
(int)AppEnum.ResponseStatusCode.Success);
}
catch (Exception ex)
{
// handle exception
response.StateModel.SetErrorMessage(AppMessageConstants.SystemError,
(int)AppEnum.ResponseStatusCode.WrongOperation);
}
return(response);
}
