-70.59% is the change from 510 to 150
Calculation steps:
[( 150 - 510 ) ÷ 510] x 100 = -70.59%
Formula
Percentage change = [(150 - 510) / 510] x 100
Subtract the new number by the original number
150 - 510 = -360
-360 ÷ 510 = -0.7058823529411765
-0.7058823529411765 x 100 = -70.59%