-52.86% is the change from 647 to 305
Calculation steps:
[( 305 - 647 ) ÷ 647] x 100 = -52.86%
Formula
Percentage change = [(305 - 647) / 647] x 100
Subtract the new number by the original number
305 - 647 = -342
-342 ÷ 647 = -0.5285935085007728
-0.5285935085007728 x 100 = -52.86%