Determine the present value of the following single amounts (FV of $1, PV of $1, FVA of $1, PVA of $1,FVAD of $1 and PVAD of $1) (Use appropriate factor(s) from the tables provided.):
Future Amount i= n= Present Value
1. $21000 6% 12
2. $15000 6% 10
3. $26000 11% 10
4. $41000 11% 6