69.8% is the change from 394 to 669
Calculation steps:
[( 669 - 394 ) ÷ 394] x 100 = 69.8%
Formula
Percentage change = [(669 - 394) / 394] x 100
Subtract the new number by the original number
669 - 394 = 275
275 ÷ 394 = 0.6979695431472082
0.6979695431472082 x 100 = 69.8%