66% is the change from 100 to 166
Calculation steps:
[( 166 - 100 ) ÷ 100] x 100 = 66%
Formula
Percentage change = [(166 - 100) / 100] x 100
Subtract the new number by the original number
166 - 100 = 66
66 ÷ 100 = 0.66
0.66 x 100 = 66%
Example