171.43% is the change from 126 to 342
Calculation steps:
[( 342 - 126 ) ÷ 126] x 100 = 171.43%
Formula
Percentage change = [(342 - 126) / 126] x 100
Subtract the new number by the original number
342 - 126 = 216
216 ÷ 126 = 1.7142857142857142
1.7142857142857142 x 100 = 171.43%