-30.08% is the change from 615 to 430
Calculation steps:
[( 430 - 615 ) ÷ 615] x 100 = -30.08%
Formula
Percentage change = [(430 - 615) / 615] x 100
Subtract the new number by the original number
430 - 615 = -185
-185 ÷ 615 = -0.3008130081300813
-0.3008130081300813 x 100 = -30.08%