-82.9% is the change from 421 to 72
Calculation steps:
[( 72 - 421 ) ÷ 421] x 100 = -82.9%
Formula
Percentage change = [(72 - 421) / 421] x 100
Subtract the new number by the original number
72 - 421 = -349
-349 ÷ 421 = -0.828978622327791
-0.828978622327791 x 100 = -82.9%