91.5% is the change from 400 to 766
Calculation steps:
[( 766 - 400 ) ÷ 400] x 100 = 91.5%
Formula
Percentage change = [(766 - 400) / 400] x 100
Subtract the new number by the original number
766 - 400 = 366
366 ÷ 400 = 0.915
0.915 x 100 = 91.5%
Example