81% is the change from 521 to 943
Calculation steps:
[( 943 - 521 ) ÷ 521] x 100 = 81%
Formula
Percentage change = [(943 - 521) / 521] x 100
Subtract the new number by the original number
943 - 521 = 422
422 ÷ 521 = 0.8099808061420346
0.8099808061420346 x 100 = 81%