-52.55% is the change from 647 to 307
Calculation steps:
[( 307 - 647 ) ÷ 647] x 100 = -52.55%
Formula
Percentage change = [(307 - 647) / 647] x 100
Subtract the new number by the original number
307 - 647 = -340
-340 ÷ 647 = -0.5255023183925811
-0.5255023183925811 x 100 = -52.55%