-57.35% is the change from 340 to 145
Calculation steps:
[( 145 - 340 ) ÷ 340] x 100 = -57.35%
Formula
Percentage change = [(145 - 340) / 340] x 100
Subtract the new number by the original number
145 - 340 = -195
-195 ÷ 340 = -0.5735294117647058
-0.5735294117647058 x 100 = -57.35%