-41.46% is the change from 521 to 305
Calculation steps:
[( 305 - 521 ) ÷ 521] x 100 = -41.46%
Formula
Percentage change = [(305 - 521) / 521] x 100
Subtract the new number by the original number
305 - 521 = -216
-216 ÷ 521 = -0.4145873320537428
-0.4145873320537428 x 100 = -41.46%