-97.4% is the change from 768 to 20
Calculation steps:
[( 20 - 768 ) ÷ 768] x 100 = -97.4%
Formula
Percentage change = [(20 - 768) / 768] x 100
Subtract the new number by the original number
20 - 768 = -748
-748 ÷ 768 = -0.9739583333333334
-0.9739583333333334 x 100 = -97.4%