92.5% is the change from 400 to 770
Calculation steps:
[( 770 - 400 ) ÷ 400] x 100 = 92.5%
Formula
Percentage change = [(770 - 400) / 400] x 100
Subtract the new number by the original number
770 - 400 = 370
370 ÷ 400 = 0.925
0.925 x 100 = 92.5%
Example