-83.44% is the change from 320 to 53
Calculation steps:
[( 53 - 320 ) ÷ 320] x 100 = -83.44%
Formula
Percentage change = [(53 - 320) / 320] x 100
Subtract the new number by the original number
53 - 320 = -267
-267 ÷ 320 = -0.834375
-0.834375 x 100 = -83.44%