Discounting one investment
This will calculate: if you have an investment and you know what the future sum will be (or an estimate of what it will be), how much to pay for it today to earn a desired return.
Example: I would like to borrow some money from you today. I can pay you back in 3 years from the sale of some stocks. My stocks should be worth $50,000 in 3 years. How much will you loan me if you receive $50,000 in 3 years and you desire a 15% return on your investment?
If they could also make equal monthly payments, use discounting a series with balloon instead.
Enter the future sum