b. What is the present value of an annuity of $2500 paid annually over four years, with the first payment to be received at the end of the first year, and with a yield currently of 6.30 per cent per annum, compounded annually?

c. What is the present value of an annuity of $1250 paid at the end of each half-year over four years, with yields currently of 6.30 per cent per annum, compounded half-yearly?

e. What is the present value of an annuity of $1250 paid at the beginning of each halfyear over four years, with yields currently of 6.30 per cent per annum, compounded halfyearly?