154.55% is the change from 330 to 840
Calculation steps:
[( 840 - 330 ) ÷ 330] x 100 = 154.55%
Formula
Percentage change = [(840 - 330) / 330] x 100
Subtract the new number by the original number
840 - 330 = 510
510 ÷ 330 = 1.5454545454545454
1.5454545454545454 x 100 = 154.55%