-22.72% is the change from 647 to 500
Calculation steps:
[( 500 - 647 ) ÷ 647] x 100 = -22.72%
Formula
Percentage change = [(500 - 647) / 647] x 100
Subtract the new number by the original number
500 - 647 = -147
-147 ÷ 647 = -0.22720247295208656
-0.22720247295208656 x 100 = -22.72%