-10% is the change from 360 to 324
Calculation steps:
[( 324 - 360 ) ÷ 360] x 100 = -10%
Formula
Percentage change = [(324 - 360) / 360] x 100
Subtract the new number by the original number
324 - 360 = -36
-36 ÷ 360 = -0.1
-0.1 x 100 = -10%
Example