-42.24% is the change from 902 to 521
Calculation steps:
[( 521 - 902 ) ÷ 902] x 100 = -42.24%
Formula
Percentage change = [(521 - 902) / 902] x 100
Subtract the new number by the original number
521 - 902 = -381
-381 ÷ 902 = -0.4223946784922395
-0.4223946784922395 x 100 = -42.24%