902.38% is the change from 42 to 421
Calculation steps:
[( 421 - 42 ) ÷ 42] x 100 = 902.38%
Formula
Percentage change = [(421 - 42) / 42] x 100
Subtract the new number by the original number
421 - 42 = 379
379 ÷ 42 = 9.023809523809524
9.023809523809524 x 100 = 902.38%