Actuarial FM question:

Given the following annual effective yield of zero-coupon bonds,

Time To maturity	1 year	2 year	3 year	4 year
Annual effective yield	7.0%	8.0%	6.5%	7.5%

find (a) the present value of a four-year, $300 par-value bond with 8% annual coupons; (b) the annual effective yield of a 4-year annuity-immediate paying $25 per year.