29.25% is the change from 400 to 517
Calculation steps:
[( 517 - 400 ) ÷ 400] x 100 = 29.25%
Formula
Percentage change = [(517 - 400) / 400] x 100
Subtract the new number by the original number
517 - 400 = 117
117 ÷ 400 = 0.2925
0.2925 x 100 = 29.25%