81.57% is the change from 521 to 946
Calculation steps:
[( 946 - 521 ) ÷ 521] x 100 = 81.57%
Formula
Percentage change = [(946 - 521) / 521] x 100
Subtract the new number by the original number
946 - 521 = 425
425 ÷ 521 = 0.8157389635316699
0.8157389635316699 x 100 = 81.57%