-9.78% is the change from 849 to 766
Calculation steps:
[( 766 - 849 ) ÷ 849] x 100 = -9.78%
Formula
Percentage change = [(766 - 849) / 849] x 100
Subtract the new number by the original number
766 - 849 = -83
-83 ÷ 849 = -0.0977620730270907
-0.0977620730270907 x 100 = -9.78%