-84.23% is the change from 647 to 102
Calculation steps:
[( 102 - 647 ) ÷ 647] x 100 = -84.23%
Formula
Percentage change = [(102 - 647) / 647] x 100
Subtract the new number by the original number
102 - 647 = -545
-545 ÷ 647 = -0.8423493044822257
-0.8423493044822257 x 100 = -84.23%