Find the amount of money that Keaton and Jana Smith must set aside today so that they will have $5,000 available to buy a home security system to one year if the annual interest reate is 5% compounded annually.
Not clear how many years. You say one year, but I'm not sure.
Anyway, plug in a value for n years, and solve for A.
A(1+.05)^n = 5000