78.8% is the change from 217 to 388
Calculation steps:
[( 388 - 217 ) ÷ 217] x 100 = 78.8%
Formula
Percentage change = [(388 - 217) / 217] x 100
Subtract the new number by the original number
388 - 217 = 171
171 ÷ 217 = 0.7880184331797235
0.7880184331797235 x 100 = 78.8%