83.88% is the change from 521 to 958
Calculation steps:
[( 958 - 521 ) ÷ 521] x 100 = 83.88%
Formula
Percentage change = [(958 - 521) / 521] x 100
Subtract the new number by the original number
958 - 521 = 437
437 ÷ 521 = 0.8387715930902111
0.8387715930902111 x 100 = 83.88%