303.53% is the change from 85 to 343
Calculation steps:
[( 343 - 85 ) ÷ 85] x 100 = 303.53%
Formula
Percentage change = [(343 - 85) / 85] x 100
Subtract the new number by the original number
343 - 85 = 258
258 ÷ 85 = 3.0352941176470587
3.0352941176470587 x 100 = 303.53%