319.01% is the change from 121 to 507
Calculation steps:
[( 507 - 121 ) ÷ 121] x 100 = 319.01%
Formula
Percentage change = [(507 - 121) / 121] x 100
Subtract the new number by the original number
507 - 121 = 386
386 ÷ 121 = 3.190082644628099
3.190082644628099 x 100 = 319.01%