241.46% is the change from 123 to 420
Calculation steps:
[( 420 - 123 ) ÷ 123] x 100 = 241.46%
Formula
Percentage change = [(420 - 123) / 123] x 100
Subtract the new number by the original number
420 - 123 = 297
297 ÷ 123 = 2.4146341463414633
2.4146341463414633 x 100 = 241.46%