400% is the change from 121 to 605
Calculation steps:
[( 605 - 121 ) ÷ 121] x 100 = 400%
Formula
Percentage change = [(605 - 121) / 121] x 100
Subtract the new number by the original number
605 - 121 = 484
484 ÷ 121 = 4
4 x 100 = 400%
Example