Please help with #2 and #3 for present value, future value and annuity due subjects:

1. Find the PV of an ordinary annuity that pays $1,000 at the end of each of the next 5 years if the interest rate is 15%.
Inputs:		PMT =		$1,000.00
		FV =
		N =		5.00
		I/YR =		15%
PV: Use function wizard (PV)		PV =	3352.16
2. How would the PV and FV of the above annuity change if it were an annuity due rather than an ordinary annuity?
Inputs:		PMT =
		FV =
		N =
		I/YR =
PV: Use function wizard (PV)		PV =
3. Find the PV of an investment that makes the following end-of-year payments. The interest rate is 8%.
Year		Payment
1		100
2		200
3		400
	Rate =	8%
To find the PV, use the NPV function:		PV =