-74.36% is the change from 78 to 20
Calculation steps:
[( 20 - 78 ) ÷ 78] x 100 = -74.36%
Formula
Percentage change = [(20 - 78) / 78] x 100
Subtract the new number by the original number
20 - 78 = -58
-58 ÷ 78 = -0.7435897435897436
-0.7435897435897436 x 100 = -74.36%