a) What is the PV of a 5-year ordinary annuity of P1,000 plus an additional P5,000 at the end of Year 5 if the interest rate is 6%? b) What is the PV if the P1,000 payments occur in Year 1 through 10 and the P5,000 comes at the end of Year 10? c) What is the PV of the following uneven cash flow stream: PO at Year 0, P1,000 in Year 1, P2,000 in Year 2, PO in Year 3, and P4,000 in Year 4 if the interest rate is 8%