103.25% is the change from 400 to 813
Calculation steps:
[( 813 - 400 ) ÷ 400] x 100 = 103.25%
Formula
Percentage change = [(813 - 400) / 400] x 100
Subtract the new number by the original number
813 - 400 = 413
413 ÷ 400 = 1.0325
1.0325 x 100 = 103.25%