Mock 2012 Ques 38

Cash has duration of 0.25

in que 37 they have rightly used while determining no of bond futures to rebalance but in que 38, cash duration is not used?

Ma frens, any help?

Isn’t Q38 a question about beta adjustment?

not its about using cash duration as 0.25 instead of 0 coz it says so. It uses it one case but not in the other?