-5% is the change from 360 to 342
Calculation steps:
[( 342 - 360 ) ÷ 360] x 100 = -5%
Formula
Percentage change = [(342 - 360) / 360] x 100
Subtract the new number by the original number
342 - 360 = -18
-18 ÷ 360 = -0.05
-0.05 x 100 = -5%
Example