-18.5% is the change from 789 to 643
Calculation steps:
[( 643 - 789 ) ÷ 789] x 100 = -18.5%
Formula
Percentage change = [(643 - 789) / 789] x 100
Subtract the new number by the original number
643 - 789 = -146
-146 ÷ 789 = -0.1850443599493029
-0.1850443599493029 x 100 = -18.5%