-70% is the change from 150 to 45
Calculation steps:
[( 45 - 150 ) ÷ 150] x 100 = -70%
Formula
Percentage change = [(45 - 150) / 150] x 100
Subtract the new number by the original number
45 - 150 = -105
-105 ÷ 150 = -0.7
-0.7 x 100 = -70%
Example