I figured this out, but I have another question.
A $1000 10% bond has semi-annual coupons. It is purchased new at $880 and is redeemable at $1020. Find the coupon amount and the effective yield rate per coupon period.
Can this problem be solved for the effective yield rate? Don't I need the number of coupon periods? The coupon amount is easy (just Fr = (1000)(0.05)), but can I answer the second half as is?