81.36% is the change from 354 to 642
Calculation steps:
[( 642 - 354 ) ÷ 354] x 100 = 81.36%
Formula
Percentage change = [(642 - 354) / 354] x 100
Subtract the new number by the original number
642 - 354 = 288
288 ÷ 354 = 0.8135593220338984
0.8135593220338984 x 100 = 81.36%