298.84% is the change from 86 to 343
Calculation steps:
[( 343 - 86 ) ÷ 86] x 100 = 298.84%
Formula
Percentage change = [(343 - 86) / 86] x 100
Subtract the new number by the original number
343 - 86 = 257
257 ÷ 86 = 2.988372093023256
2.988372093023256 x 100 = 298.84%