-80.63% is the change from 320 to 62
Calculation steps:
[( 62 - 320 ) ÷ 320] x 100 = -80.63%
Formula
Percentage change = [(62 - 320) / 320] x 100
Subtract the new number by the original number
62 - 320 = -258
-258 ÷ 320 = -0.80625
-0.80625 x 100 = -80.63%