1235.9% is the change from 39 to 521
Calculation steps:
[( 521 - 39 ) ÷ 39] x 100 = 1235.9%
Formula
Percentage change = [(521 - 39) / 39] x 100
Subtract the new number by the original number
521 - 39 = 482
482 ÷ 39 = 12.35897435897436
12.35897435897436 x 100 = 1235.9%