-84.87% is the change from 423 to 64
Calculation steps:
[( 64 - 423 ) ÷ 423] x 100 = -84.87%
Formula
Percentage change = [(64 - 423) / 423] x 100
Subtract the new number by the original number
64 - 423 = -359
-359 ÷ 423 = -0.8486997635933806
-0.8486997635933806 x 100 = -84.87%