-52.7% is the change from 647 to 306
Calculation steps:
[( 306 - 647 ) ÷ 647] x 100 = -52.7%
Formula
Percentage change = [(306 - 647) / 647] x 100
Subtract the new number by the original number
306 - 647 = -341
-341 ÷ 647 = -0.527047913446677
-0.527047913446677 x 100 = -52.7%