1. How much would you pay for a semi-annual 5% coupon bond with 25 years left until maturity that yields 3.50%?

2.If you purchased a semi-annual 8% coupon bond for $1185.90, that yields 6%, how many years are left before this bond matures?

I have posted this several times... no on seems to understand it because i have yet to recieve an answer.. please answer and discuss the process in which the answer was arrived at. Thank you,,, pleaseee