-19.27% is the change from 768 to 620
Calculation steps:
[( 620 - 768 ) ÷ 768] x 100 = -19.27%
Formula
Percentage change = [(620 - 768) / 768] x 100
Subtract the new number by the original number
620 - 768 = -148
-148 ÷ 768 = -0.19270833333333334
-0.19270833333333334 x 100 = -19.27%