81.88% is the change from 138 to 251
Calculation steps:
[( 251 - 138 ) ÷ 138] x 100 = 81.88%
Formula
Percentage change = [(251 - 138) / 138] x 100
Subtract the new number by the original number
251 - 138 = 113
113 ÷ 138 = 0.8188405797101449
0.8188405797101449 x 100 = 81.88%