84.44% is the change from 90 to 166
Calculation steps:
[( 166 - 90 ) ÷ 90] x 100 = 84.44%
Formula
Percentage change = [(166 - 90) / 90] x 100
Subtract the new number by the original number
166 - 90 = 76
76 ÷ 90 = 0.8444444444444444
0.8444444444444444 x 100 = 84.44%