91% is the change from 400 to 764
Calculation steps:
[( 764 - 400 ) ÷ 400] x 100 = 91%
Formula
Percentage change = [(764 - 400) / 400] x 100
Subtract the new number by the original number
764 - 400 = 364
364 ÷ 400 = 0.91
0.91 x 100 = 91%
Example