-62.19% is the change from 320 to 121
Calculation steps:
[( 121 - 320 ) ÷ 320] x 100 = -62.19%
Formula
Percentage change = [(121 - 320) / 320] x 100
Subtract the new number by the original number
121 - 320 = -199
-199 ÷ 320 = -0.621875
-0.621875 x 100 = -62.19%