Hello again :)
Your answers are correct. As for part 3, after 3 years, the time to maturity will be 7 years, and as you know, the price of the bond equals the present value of all future cash flows (that includes the PV of Coupon Payments + Present Value of the Face Value).
Please click here for the excel sheet with all calculations
Sorry about that, although when I opened it, all figures showed , PC's are STRANGE :)
Please click here