312.4% is the change from 121 to 499
Calculation steps:
[( 499 - 121 ) ÷ 121] x 100 = 312.4%
Formula
Percentage change = [(499 - 121) / 121] x 100
Subtract the new number by the original number
499 - 121 = 378
378 ÷ 121 = 3.12396694214876
3.12396694214876 x 100 = 312.4%