CFAI EOC Reading 23 Equity Q 11.D

CFA Level III Equities
#1

I didn’t post the question as it has a table needed, could someone please help with the following:

I am unsure of how the answer quotes, “an increase in IR by a factor of 2.17 versus the current mix.” The first part about the calculation of the IR makes complete sense, just not able to put together where they got 2.17 in the answer.

Thanks!

#2

ratio of IR in the new portfolio mix / IR with 30/70 mix (0.67 calculated in Step b)

#3

ahhh, thanks! Easy!