-91.3% is the change from 230 to 20
Calculation steps:
[( 20 - 230 ) ÷ 230] x 100 = -91.3%
Formula
Percentage change = [(20 - 230) / 230] x 100
Subtract the new number by the original number
20 - 230 = -210
-210 ÷ 230 = -0.9130434782608695
-0.9130434782608695 x 100 = -91.3%