492.86% is the change from 140 to 830
Calculation steps:
[( 830 - 140 ) ÷ 140] x 100 = 492.86%
Formula
Percentage change = [(830 - 140) / 140] x 100
Subtract the new number by the original number
830 - 140 = 690
690 ÷ 140 = 4.928571428571429
4.928571428571429 x 100 = 492.86%