Reading 15 EOC 11 (cal. 3 year CAGR)

CFA Level III Economics
#1

How to cal. 3 year CAGR in EOC 11 reading 15?

what do 7.7% and 2.5% stand for?

#2

1.025^3 = 1.0768 …

#3

Thanks and how do I calculate 2.5% (using my financial calculator or otherwise)?

#4

(127.4/124.3) - 1 = 2.4940%

(124.3/121.3) - 1 = 2.4732%

(121.3/118.3) - 1 = 2.5359%

(2.4940 + 2.4732 + 2.5359) / 3 = 2.5010% = 3 year average annual growth

#5

Thanks