-90.14% is the change from 345 to 34
Calculation steps:
[( 34 - 345 ) ÷ 345] x 100 = -90.14%
Formula
Percentage change = [(34 - 345) / 345] x 100
Subtract the new number by the original number
34 - 345 = -311
-311 ÷ 345 = -0.9014492753623189
-0.9014492753623189 x 100 = -90.14%