721.43% is the change from 42 to 345
Calculation steps:
[( 345 - 42 ) ÷ 42] x 100 = 721.43%
Formula
Percentage change = [(345 - 42) / 42] x 100
Subtract the new number by the original number
345 - 42 = 303
303 ÷ 42 = 7.214285714285714
7.214285714285714 x 100 = 721.43%