81.07% is the change from 338 to 612
Calculation steps:
[( 612 - 338 ) ÷ 338] x 100 = 81.07%
Formula
Percentage change = [(612 - 338) / 338] x 100
Subtract the new number by the original number
612 - 338 = 274
274 ÷ 338 = 0.8106508875739645
0.8106508875739645 x 100 = 81.07%