129.25% is the change from 400 to 917
Calculation steps:
[( 917 - 400 ) ÷ 400] x 100 = 129.25%
Formula
Percentage change = [(917 - 400) / 400] x 100
Subtract the new number by the original number
917 - 400 = 517
517 ÷ 400 = 1.2925
1.2925 x 100 = 129.25%