6.85% is the change from 394 to 421
Calculation steps:
[( 421 - 394 ) ÷ 394] x 100 = 6.85%
Formula
Percentage change = [(421 - 394) / 394] x 100
Subtract the new number by the original number
421 - 394 = 27
27 ÷ 394 = 0.06852791878172589
0.06852791878172589 x 100 = 6.85%