I need help with the following questions.  1. How much would you pay for a perpetual bond that pays an annual...

I need help with the following questions. 

1. How much would you pay for a perpetual bond that pays an annual coupon of $80 per year and yields on competing instruments are 5%?. 

2. If competing yields are expected to change to 15%, what is the current yield on this same bond assuming that you paid $1,600? 

3. If you sell this bond in exactly one year, having paid $1,600, and received exactly one coupon payment, what is your total return if competing yields are 15%? 

"I have figured out part 1 which comes to $1,600, but I am lost on questions 2 and 3." 

I appreciate your help!