-21.57% is the change from 612 to 480
Calculation steps:
[( 480 - 612 ) ÷ 612] x 100 = -21.57%
Formula
Percentage change = [(480 - 612) / 612] x 100
Subtract the new number by the original number
480 - 612 = -132
-132 ÷ 612 = -0.21568627450980393
-0.21568627450980393 x 100 = -21.57%