Need help with questions 1 , 2 , and 3

1. A Muni Bond yields 3% and a taxable bond yields 5%. At what tax rate would you be indifferent between the two bonds? 2. What is the price of a 10 -year bond ( $1000 face value) that has an 6% annual coupon if YTM is 8% ? 3. What is the price of the same bond if the coupon is semi-annual