289.16% is the change from 83 to 323
Calculation steps:
[( 323 - 83 ) ÷ 83] x 100 = 289.16%
Formula
Percentage change = [(323 - 83) / 83] x 100
Subtract the new number by the original number
323 - 83 = 240
240 ÷ 83 = 2.891566265060241
2.891566265060241 x 100 = 289.16%