297.67% is the change from 86 to 342
Calculation steps:
[( 342 - 86 ) ÷ 86] x 100 = 297.67%
Formula
Percentage change = [(342 - 86) / 86] x 100
Subtract the new number by the original number
342 - 86 = 256
256 ÷ 86 = 2.9767441860465116
2.9767441860465116 x 100 = 297.67%