289.77% is the change from 88 to 343
Calculation steps:
[( 343 - 88 ) ÷ 88] x 100 = 289.77%
Formula
Percentage change = [(343 - 88) / 88] x 100
Subtract the new number by the original number
343 - 88 = 255
255 ÷ 88 = 2.897727272727273
2.897727272727273 x 100 = 289.77%