-98.45% is the change from 647 to 10
Calculation steps:
[( 10 - 647 ) ÷ 647] x 100 = -98.45%
Formula
Percentage change = [(10 - 647) / 647] x 100
Subtract the new number by the original number
10 - 647 = -637
-637 ÷ 647 = -0.9845440494590417
-0.9845440494590417 x 100 = -98.45%