-40% is the change from 345 to 207
Calculation steps:
[( 207 - 345 ) ÷ 345] x 100 = -40%
Formula
Percentage change = [(207 - 345) / 345] x 100
Subtract the new number by the original number
207 - 345 = -138
-138 ÷ 345 = -0.4
-0.4 x 100 = -40%
Example