-83.41% is the change from 615 to 102
Calculation steps:
[( 102 - 615 ) ÷ 615] x 100 = -83.41%
Formula
Percentage change = [(102 - 615) / 615] x 100
Subtract the new number by the original number
102 - 615 = -513
-513 ÷ 615 = -0.8341463414634146
-0.8341463414634146 x 100 = -83.41%