-19.23% is the change from 780 to 630
Calculation steps:
[( 630 - 780 ) ÷ 780] x 100 = -19.23%
Formula
Percentage change = [(630 - 780) / 780] x 100
Subtract the new number by the original number
630 - 780 = -150
-150 ÷ 780 = -0.19230769230769232
-0.19230769230769232 x 100 = -19.23%