2150% is the change from 42 to 945
Calculation steps:
[( 945 - 42 ) ÷ 42] x 100 = 2150%
Formula
Percentage change = [(945 - 42) / 42] x 100
Subtract the new number by the original number
945 - 42 = 903
903 ÷ 42 = 21.5
21.5 x 100 = 2150%
Example