-55.56% is the change from 45 to 20
Calculation steps:
[( 20 - 45 ) ÷ 45] x 100 = -55.56%
Formula
Percentage change = [(20 - 45) / 45] x 100
Subtract the new number by the original number
20 - 45 = -25
-25 ÷ 45 = -0.5555555555555556
-0.5555555555555556 x 100 = -55.56%