-91.94% is the change from 521 to 42
Calculation steps:
[( 42 - 521 ) ÷ 521] x 100 = -91.94%
Formula
Percentage change = [(42 - 521) / 521] x 100
Subtract the new number by the original number
42 - 521 = -479
-479 ÷ 521 = -0.9193857965451055
-0.9193857965451055 x 100 = -91.94%