-80.94% is the change from 320 to 61
Calculation steps:
[( 61 - 320 ) ÷ 320] x 100 = -80.94%
Formula
Percentage change = [(61 - 320) / 320] x 100
Subtract the new number by the original number
61 - 320 = -259
-259 ÷ 320 = -0.809375
-0.809375 x 100 = -80.94%