-96.75% is the change from 615 to 20
Calculation steps:
[( 20 - 615 ) ÷ 615] x 100 = -96.75%
Formula
Percentage change = [(20 - 615) / 615] x 100
Subtract the new number by the original number
20 - 615 = -595
-595 ÷ 615 = -0.967479674796748
-0.967479674796748 x 100 = -96.75%