-18.38% is the change from 789 to 644
Calculation steps:
[( 644 - 789 ) ÷ 789] x 100 = -18.38%
Formula
Percentage change = [(644 - 789) / 789] x 100
Subtract the new number by the original number
644 - 789 = -145
-145 ÷ 789 = -0.18377693282636248
-0.18377693282636248 x 100 = -18.38%