-70% is the change from 500 to 150
Calculation steps:
[( 150 - 500 ) ÷ 500] x 100 = -70%
Formula
Percentage change = [(150 - 500) / 500] x 100
Subtract the new number by the original number
150 - 500 = -350
-350 ÷ 500 = -0.7
-0.7 x 100 = -70%
Example