271.9% is the change from 121 to 450
Calculation steps:
[( 450 - 121 ) ÷ 121] x 100 = 271.9%
Formula
Percentage change = [(450 - 121) / 121] x 100
Subtract the new number by the original number
450 - 121 = 329
329 ÷ 121 = 2.71900826446281
2.71900826446281 x 100 = 271.9%