I have just one questioned I couldn't figure out on my homework assignment this week for my Fundamentals of Investing course. Please help me out and clearly show how to compute this problem. Thank you!

Compute the current yield of a 10% coupon, 25 year bond that is currently priced in the market at $1,200. Use annual compounding to find the promised yield on this bond. Repeat the promised yield calculation, but this time use semiannual compounding to find yield-to-maturity.