71.25% is the change from 400 to 685
Calculation steps:
[( 685 - 400 ) ÷ 400] x 100 = 71.25%
Formula
Percentage change = [(685 - 400) / 400] x 100
Subtract the new number by the original number
685 - 400 = 285
285 ÷ 400 = 0.7125
0.7125 x 100 = 71.25%