-16.45% is the change from 766 to 640
Calculation steps:
[( 640 - 766 ) ÷ 766] x 100 = -16.45%
Formula
Percentage change = [(640 - 766) / 766] x 100
Subtract the new number by the original number
640 - 766 = -126
-126 ÷ 766 = -0.16449086161879894
-0.16449086161879894 x 100 = -16.45%