1211.9% is the change from 42 to 551
Calculation steps:
[( 551 - 42 ) ÷ 42] x 100 = 1211.9%
Formula
Percentage change = [(551 - 42) / 42] x 100
Subtract the new number by the original number
551 - 42 = 509
509 ÷ 42 = 12.119047619047619
12.119047619047619 x 100 = 1211.9%