-64.04% is the change from 342 to 123
Calculation steps:
[( 123 - 342 ) ÷ 342] x 100 = -64.04%
Formula
Percentage change = [(123 - 342) / 342] x 100
Subtract the new number by the original number
123 - 342 = -219
-219 ÷ 342 = -0.6403508771929824
-0.6403508771929824 x 100 = -64.04%