private string Calculate(Mortgage vars)
{
vars.DownPayment = vars.DownPayment / 100;
this.CalculateMortgage(vars);
var totals = new StringBuilder();
vars.DownPayment = .05m;
totals.AppendLine("Total @ 5%: " + this.CalculateMortgage(vars));
vars.DownPayment = .10m;
totals.AppendLine("Total @ 10%: " + this.CalculateMortgage(vars));
vars.DownPayment = .15m;
totals.AppendLine("Total @ 15%: " + this.CalculateMortgage(vars));
vars.DownPayment = .20m;
totals.AppendLine("Total @ 20%: " + this.CalculateMortgage(vars));
vars.DownPayment = .25m;
totals.AppendLine("Total @ 25%: " + this.CalculateMortgage(vars));
return(totals.ToString());
}
private string CalculateMortgage(Mortgage vars)
{
var downPaymentPercentage = vars.DownPayment / 100;
vars.MortgageInsurance = vars.Principal * (decimal).0075 / 12;
var rate = vars.InterestRate / 100 / 12;
var downPayment = vars.Principal * downPaymentPercentage;
var houseCost = vars.Principal;
var principal = houseCost - downPayment;
var months = vars.Years * 12;
var insurance = vars.MortgageInsurance / 12;
var taxes = vars.Taxes / 12;
var pmi = vars.MortgageInsurance;
var numerator = rate * Convert.ToDecimal(Math.Pow((double)(1 + rate), months));
var denominator = Convert.ToDecimal(Math.Pow((double)(1 + rate), months) - 1);
var payment = principal * numerator / denominator;
var log = new StringBuilder();
log.AppendLine($"Down Payment: {downPayment:C}");
log.AppendLine($"Payment: {payment:C}");
log.AppendLine($"Insurance: {insurance:C}");
log.AppendLine($"Taxes: {taxes:C}");
log.AppendLine($"PMI: {pmi:C}");
log.AppendLine($"Total: {(payment + insurance + taxes + pmi):C}");
decimal totalInterest = 0;
decimal totalPrincipal = 0;
decimal totalPmi = 0;
for (int i = 0; i < months; i++)
{
var interestPayment = principal * rate;
var principalPayment = payment - interestPayment;
totalInterest += interestPayment;
totalPrincipal += principalPayment;
var twentyPercent = houseCost * .20m;
var ownedValue = downPayment + totalPrincipal;
if (ownedValue < twentyPercent)
{
totalPmi += pmi;
}
principal = principal - principalPayment;
}
var total = totalPmi + totalPrincipal + totalInterest;
log.AppendLine($"Total Principal: {totalPrincipal:C}");
log.AppendLine($"Total Interest: {totalInterest:C}");
log.AppendLine($"Total PMI: {totalPmi:C}");
log.AppendLine($"Total: {total:C}");
////var monthsSaving = downPayment / (double)SavingsPerMonthInput.Value;
////var totalRentWhileSaving = monthsSaving * (double)RentPerMonthInput.Value;
////log = new StringBuilder();
////log.AppendLine($"Months Saving: {monthsSaving}");
////log.AppendLine($"Rent Cost: {totalRentWhileSaving:C}");
return(log.ToString());
}