66.75% is the change from 394 to 657
Calculation steps:
[( 657 - 394 ) ÷ 394] x 100 = 66.75%
Formula
Percentage change = [(657 - 394) / 394] x 100
Subtract the new number by the original number
657 - 394 = 263
263 ÷ 394 = 0.6675126903553299
0.6675126903553299 x 100 = 66.75%