55.8% is the change from 138 to 215
Calculation steps:
[( 215 - 138 ) ÷ 138] x 100 = 55.8%
Formula
Percentage change = [(215 - 138) / 138] x 100
Subtract the new number by the original number
215 - 138 = 77
77 ÷ 138 = 0.5579710144927537
0.5579710144927537 x 100 = 55.8%