Explanation:
29,035 ft in 1999.
today is 2021. the difference is 22 years.
the growth rate is 2.4 inches per year.
so, in 22 years it grew 2.4×22 = 52.8 in
1 ft = 12 in
52.8 in = 4 ft 4.8 in = 52.8/12 ft = 4.4 ft
so, it should be now 29,039.4 ft above sea level.