Please help me answer for letter (b), I got answer (a) correct, but can't understand how to get letter b & C.

Question 12 of 15 0.83 / 2.5 (c) Your Answer Correct Answer (Used) X Your answer is incorrect. 25 years to maturity, 8.5% coupon rate, current price is $1,030. (Round answer to 2 decimal places, e.g. 52.75.) Yield to maturity 6.99 % e Textbook and Media Attempts: 2 of 2 used Question 12 of 15 0.83 / 2.5 III What is the yield to maturity for the following bonds? Assume these are bonds issued in the U.S. Use the Excel RATE function to solve. (a) Your answer is correct. 10 years to maturity, 6% coupon rate, current price is $950. (Round answer to 2 decimal places, e.g. 52.75.) Yield to maturity 6.69 % e Textbook and Media Question 12 of 15 0.83 / 2.5 (b) Your Answer Correct Answer X Your answer is incorrect. 16 years to maturity, 0% coupon rate, current price is $339. (Round answer to 2 decimal places, e.g. 52.75.) Yield to maturity 6.69 % e Textbook and Media Attempts: 2 of 2 used