-49.02% is the change from 612 to 312
Calculation steps:
[( 312 - 612 ) ÷ 612] x 100 = -49.02%
Formula
Percentage change = [(312 - 612) / 612] x 100
Subtract the new number by the original number
312 - 612 = -300
-300 ÷ 612 = -0.49019607843137253
-0.49019607843137253 x 100 = -49.02%