-89.68% is the change from 620 to 64
Calculation steps:
[( 64 - 620 ) ÷ 620] x 100 = -89.68%
Formula
Percentage change = [(64 - 620) / 620] x 100
Subtract the new number by the original number
64 - 620 = -556
-556 ÷ 620 = -0.896774193548387
-0.896774193548387 x 100 = -89.68%