Please provide me a good formula for my discussion post! Thanks

This week our discussion will center around exponents and polynomials in the real world. The Present Value Formula requires a good understanding of exponents. Present Value is a formula that calculates the present-day amount of a value to be received at a future date.

From the assignment instructions above:

"The Present Value Formula is:

PV =PV is the present value that will amount to FV dollars in n years at interest rate r compounded annually."

PV = Present Value

FV = Future Value

r = rate ( as a decimal 10% = .10

n = number of years

PV= FV /(1 + r)n

Let's look at an example:

I would like to invest in a rental property for an additional stream of income. The house I want to buy is listed for $55,000. So I need to know how much I have to invest today to have $55,000 in 15 years at an interest rate of 10%.

The formula is:

PV= FV /(1 + r)n

PV = 55,000/(1 + .10)15

PV = 13,167.34

So I will need to invest $13,167.34 now to have the $55,000 in 15 years.

Looking forward to seeing your examples!