312.05% is the change from 83 to 342
Calculation steps:
[( 342 - 83 ) ÷ 83] x 100 = 312.05%
Formula
Percentage change = [(342 - 83) / 83] x 100
Subtract the new number by the original number
342 - 83 = 259
259 ÷ 83 = 3.1204819277108435
3.1204819277108435 x 100 = 312.05%