-80.07% is the change from 306 to 61
Calculation steps:
[( 61 - 306 ) ÷ 306] x 100 = -80.07%
Formula
Percentage change = [(61 - 306) / 306] x 100
Subtract the new number by the original number
61 - 306 = -245
-245 ÷ 306 = -0.8006535947712419
-0.8006535947712419 x 100 = -80.07%