274.7% is the change from 83 to 311
Calculation steps:
[( 311 - 83 ) ÷ 83] x 100 = 274.7%
Formula
Percentage change = [(311 - 83) / 83] x 100
Subtract the new number by the original number
311 - 83 = 228
228 ÷ 83 = 2.746987951807229
2.746987951807229 x 100 = 274.7%