-18.75% is the change from 768 to 624
Calculation steps:
[( 624 - 768 ) ÷ 768] x 100 = -18.75%
Formula
Percentage change = [(624 - 768) / 768] x 100
Subtract the new number by the original number
624 - 768 = -144
-144 ÷ 768 = -0.1875
-0.1875 x 100 = -18.75%