A $1000 bond with coupons at j2 = 10% is redeemable at par in n years. It is purchased at a premium of $300. Another $1000 bond with coupons at j2 = 8% is also redeemable at par in n years. It is purchased at a premium of $100 on the same yield basis. a) Calculate the unknown yield rate, 12. (Do not round intermediate calculations.) Unknown yield rate, ja % b) Determine n. (Do not round intermediate calculations. Round your answer to 1 decimal place.) years