273.49% is the change from 83 to 310
Calculation steps:
[( 310 - 83 ) ÷ 83] x 100 = 273.49%
Formula
Percentage change = [(310 - 83) / 83] x 100
Subtract the new number by the original number
310 - 83 = 227
227 ÷ 83 = 2.7349397590361444
2.7349397590361444 x 100 = 273.49%