-75.38% is the change from 520 to 128
Calculation steps:
[( 128 - 520 ) ÷ 520] x 100 = -75.38%
Formula
Percentage change = [(128 - 520) / 520] x 100
Subtract the new number by the original number
128 - 520 = -392
-392 ÷ 520 = -0.7538461538461538
-0.7538461538461538 x 100 = -75.38%