-29.67% is the change from 920 to 647
Calculation steps:
[( 647 - 920 ) ÷ 920] x 100 = -29.67%
Formula
Percentage change = [(647 - 920) / 920] x 100
Subtract the new number by the original number
647 - 920 = -273
-273 ÷ 920 = -0.2967391304347826
-0.2967391304347826 x 100 = -29.67%