81.57% is the change from 217 to 394
Calculation steps:
[( 394 - 217 ) ÷ 217] x 100 = 81.57%
Formula
Percentage change = [(394 - 217) / 217] x 100
Subtract the new number by the original number
394 - 217 = 177
177 ÷ 217 = 0.815668202764977
0.815668202764977 x 100 = 81.57%