68.5% is the change from 400 to 674
Calculation steps:
[( 674 - 400 ) ÷ 400] x 100 = 68.5%
Formula
Percentage change = [(674 - 400) / 400] x 100
Subtract the new number by the original number
674 - 400 = 274
274 ÷ 400 = 0.685
0.685 x 100 = 68.5%
Example