709.52% is the change from 42 to 340
Calculation steps:
[( 340 - 42 ) ÷ 42] x 100 = 709.52%
Formula
Percentage change = [(340 - 42) / 42] x 100
Subtract the new number by the original number
340 - 42 = 298
298 ÷ 42 = 7.095238095238095
7.095238095238095 x 100 = 709.52%