148.5% is the change from 334 to 830
Calculation steps:
[( 830 - 334 ) ÷ 334] x 100 = 148.5%
Formula
Percentage change = [(830 - 334) / 334] x 100
Subtract the new number by the original number
830 - 334 = 496
496 ÷ 334 = 1.4850299401197604
1.4850299401197604 x 100 = 148.5%