-93.44% is the change from 305 to 20
Calculation steps:
[( 20 - 305 ) ÷ 305] x 100 = -93.44%
Formula
Percentage change = [(20 - 305) / 305] x 100
Subtract the new number by the original number
20 - 305 = -285
-285 ÷ 305 = -0.9344262295081968
-0.9344262295081968 x 100 = -93.44%
Example