81.38% is the change from 521 to 945
Calculation steps:
[( 945 - 521 ) ÷ 521] x 100 = 81.38%
Formula
Percentage change = [(945 - 521) / 521] x 100
Subtract the new number by the original number
945 - 521 = 424
424 ÷ 521 = 0.8138195777351248
0.8138195777351248 x 100 = 81.38%