97.44% is the change from 39 to 77
Calculation steps:
[( 77 - 39 ) ÷ 39] x 100 = 97.44%
Formula
Percentage change = [(77 - 39) / 39] x 100
Subtract the new number by the original number
77 - 39 = 38
38 ÷ 39 = 0.9743589743589743
0.9743589743589743 x 100 = 97.44%