15.55% is the change from 521 to 602
Calculation steps:
[( 602 - 521 ) ÷ 521] x 100 = 15.55%
Formula
Percentage change = [(602 - 521) / 521] x 100
Subtract the new number by the original number
602 - 521 = 81
81 ÷ 521 = 0.15547024952015356
0.15547024952015356 x 100 = 15.55%