66.27% is the change from 83 to 138
Calculation steps:
[( 138 - 83 ) ÷ 83] x 100 = 66.27%
Formula
Percentage change = [(138 - 83) / 83] x 100
Subtract the new number by the original number
138 - 83 = 55
55 ÷ 83 = 0.6626506024096386
0.6626506024096386 x 100 = 66.27%