-51.16% is the change from 647 to 316
Calculation steps:
[( 316 - 647 ) ÷ 647] x 100 = -51.16%
Formula
Percentage change = [(316 - 647) / 647] x 100
Subtract the new number by the original number
316 - 647 = -331
-331 ÷ 647 = -0.5115919629057187
-0.5115919629057187 x 100 = -51.16%
Example