-49.35% is the change from 612 to 310
Calculation steps:
[( 310 - 612 ) ÷ 612] x 100 = -49.35%
Formula
Percentage change = [(310 - 612) / 612] x 100
Subtract the new number by the original number
310 - 612 = -302
-302 ÷ 612 = -0.4934640522875817
-0.4934640522875817 x 100 = -49.35%