50% is the change from 82 to 123
Calculation steps:
[( 123 - 82 ) ÷ 82] x 100 = 50%
Formula
Percentage change = [(123 - 82) / 82] x 100
Subtract the new number by the original number
123 - 82 = 41
41 ÷ 82 = 0.5
0.5 x 100 = 50%
Example