-94.2% is the change from 345 to 20
Calculation steps:
[( 20 - 345 ) ÷ 345] x 100 = -94.2%
Formula
Percentage change = [(20 - 345) / 345] x 100
Subtract the new number by the original number
20 - 345 = -325
-325 ÷ 345 = -0.9420289855072463
-0.9420289855072463 x 100 = -94.2%
Example