Pension PBO cal. Example 2 Curriculum...Tough!

CFA Level II FRA
#1

Hey,

Has anyone tried out the sum of PBO cal in Curriculum Example 2. Why the scenario 2 and 4 so complex…can anyone explain. I got Scenario easily as per the method illustrated in Kaplan…

Please see, its a good quesiton!

#2

?

#3

Has anyone attempted?