Imagine, one person is going to invest X $. There are two options:
- put money on the deposit at any well-known bank and have r % annual return which equals to the interest rate in that country.
- lend money to a new growing business and have R % annual return (R>r). Second option brings higher return but involves taking some risk in case of business bankruptcy. After investigating information about the start-up business and its founders, the person has figured out that default of that growing company is very unlikely, so it's really a good opportunity to make such investment to have extra return comparing to the market interest rate. So, the second option has been chosen. Investment details:
- Interest rate is R % per year.
- A borrower should return his debt as fixed payment each month. Monthly payment doesn't change each month and represents the sum of two components: part of initial principal and interest amount.
- Interest amount is calculated on the outstanding principal amount.
- Investment duration is N years (it means last refund payment should be done in N years after making the investment)
Application takes: Agreement date, Calculation date, X, R and N as input data and calculates Sum of all future interest payments.
The solution is divided into 3 projects:
- Business logic
- Web application
- Unit tests
.Net 6 Asp.Net Core
XUnit - for unit testing
FluentValidation - for convinient data validation
For debugging:
dotnet runFor production release:
dotnet run --ReleaseMIT
by Tymur Krasnianskyi