86.76% is the change from 521 to 973
Calculation steps:
[( 973 - 521 ) ÷ 521] x 100 = 86.76%
Formula
Percentage change = [(973 - 521) / 521] x 100
Subtract the new number by the original number
973 - 521 = 452
452 ÷ 521 = 0.8675623800383877
0.8675623800383877 x 100 = 86.76%