-42.22% is the change from 900 to 520
Calculation steps:
[( 520 - 900 ) ÷ 900] x 100 = -42.22%
Formula
Percentage change = [(520 - 900) / 900] x 100
Subtract the new number by the original number
520 - 900 = -380
-380 ÷ 900 = -0.4222222222222222
-0.4222222222222222 x 100 = -42.22%