-22.22% is the change from 99 to 77
Calculation steps:
[( 77 - 99 ) ÷ 99] x 100 = -22.22%
Formula
Percentage change = [(77 - 99) / 99] x 100
Subtract the new number by the original number
77 - 99 = -22
-22 ÷ 99 = -0.2222222222222222
-0.2222222222222222 x 100 = -22.22%