91.07% is the change from 336 to 642
Calculation steps:
[( 642 - 336 ) ÷ 336] x 100 = 91.07%
Formula
Percentage change = [(642 - 336) / 336] x 100
Subtract the new number by the original number
642 - 336 = 306
306 ÷ 336 = 0.9107142857142857
0.9107142857142857 x 100 = 91.07%