971.43% is the change from 42 to 450
Calculation steps:
[( 450 - 42 ) ÷ 42] x 100 = 971.43%
Formula
Percentage change = [(450 - 42) / 42] x 100
Subtract the new number by the original number
450 - 42 = 408
408 ÷ 42 = 9.714285714285714
9.714285714285714 x 100 = 971.43%