-6.71% is the change from 820 to 765
Calculation steps:
[( 765 - 820 ) ÷ 820] x 100 = -6.71%
Formula
Percentage change = [(765 - 820) / 820] x 100
Subtract the new number by the original number
765 - 820 = -55
-55 ÷ 820 = -0.06707317073170732
-0.06707317073170732 x 100 = -6.71%