-30% is the change from 150 to 105
Calculation steps:
[( 105 - 150 ) ÷ 150] x 100 = -30%
Formula
Percentage change = [(105 - 150) / 150] x 100
Subtract the new number by the original number
105 - 150 = -45
-45 ÷ 150 = -0.3
-0.3 x 100 = -30%
Example