-45% is the change from 340 to 187
Calculation steps:
[( 187 - 340 ) ÷ 340] x 100 = -45%
Formula
Percentage change = [(187 - 340) / 340] x 100
Subtract the new number by the original number
187 - 340 = -153
-153 ÷ 340 = -0.45
-0.45 x 100 = -45%
Example