302.35% is the change from 85 to 342
Calculation steps:
[( 342 - 85 ) ÷ 85] x 100 = 302.35%
Formula
Percentage change = [(342 - 85) / 85] x 100
Subtract the new number by the original number
342 - 85 = 257
257 ÷ 85 = 3.023529411764706
3.023529411764706 x 100 = 302.35%