67.97% is the change from 128 to 215
Calculation steps:
[( 215 - 128 ) ÷ 128] x 100 = 67.97%
Formula
Percentage change = [(215 - 128) / 128] x 100
Subtract the new number by the original number
215 - 128 = 87
87 ÷ 128 = 0.6796875
0.6796875 x 100 = 67.97%