-82.93% is the change from 615 to 105
Calculation steps:
[( 105 - 615 ) ÷ 615] x 100 = -82.93%
Formula
Percentage change = [(105 - 615) / 615] x 100
Subtract the new number by the original number
105 - 615 = -510
-510 ÷ 615 = -0.8292682926829268
-0.8292682926829268 x 100 = -82.93%