1209.52% is the change from 42 to 550
Calculation steps:
[( 550 - 42 ) ÷ 42] x 100 = 1209.52%
Formula
Percentage change = [(550 - 42) / 42] x 100
Subtract the new number by the original number
550 - 42 = 508
508 ÷ 42 = 12.095238095238095
12.095238095238095 x 100 = 1209.52%