-9.09% is the change from 165 to 150
Calculation steps:
[( 150 - 165 ) ÷ 165] x 100 = -9.09%
Formula
Percentage change = [(150 - 165) / 165] x 100
Subtract the new number by the original number
150 - 165 = -15
-15 ÷ 165 = -0.09090909090909091
-0.09090909090909091 x 100 = -9.09%