-17.73% is the change from 784 to 645
Calculation steps:
[( 645 - 784 ) ÷ 784] x 100 = -17.73%
Formula
Percentage change = [(645 - 784) / 784] x 100
Subtract the new number by the original number
645 - 784 = -139
-139 ÷ 784 = -0.17729591836734693
-0.17729591836734693 x 100 = -17.73%