309.52% is the change from 84 to 344
Calculation steps:
[( 344 - 84 ) ÷ 84] x 100 = 309.52%
Formula
Percentage change = [(344 - 84) / 84] x 100
Subtract the new number by the original number
344 - 84 = 260
260 ÷ 84 = 3.0952380952380953
3.0952380952380953 x 100 = 309.52%