511.9% is the change from 42 to 257
Calculation steps:
[( 257 - 42 ) ÷ 42] x 100 = 511.9%
Formula
Percentage change = [(257 - 42) / 42] x 100
Subtract the new number by the original number
257 - 42 = 215
215 ÷ 42 = 5.119047619047619
5.119047619047619 x 100 = 511.9%