-34% is the change from 150 to 99
Calculation steps:
[( 99 - 150 ) ÷ 150] x 100 = -34%
Formula
Percentage change = [(99 - 150) / 150] x 100
Subtract the new number by the original number
99 - 150 = -51
-51 ÷ 150 = -0.34
-0.34 x 100 = -34%
Example