Please show as much work as possible, it was advised to use excel.

6. 7.76 a) Use the adjacent tree to price a 4-year multi-step up callable bond. The bond pays a coupon of 4.5% for Year 1, 5.5% for Year 2 and 6.5% for Year 3. The bond is callable at $99 from Year 1 onwards. 6.21 b) What is the value of the option 9.32 7.01 5.43 5.74 3.45 4.45 4.7 5.03