-83.11% is the change from 521 to 88
Calculation steps:
[( 88 - 521 ) ÷ 521] x 100 = -83.11%
Formula
Percentage change = [(88 - 521) / 521] x 100
Subtract the new number by the original number
88 - 521 = -433
-433 ÷ 521 = -0.8310940499040307
-0.8310940499040307 x 100 = -83.11%