21.17% is the change from 685 to 830
Calculation steps:
[( 830 - 685 ) ÷ 685] x 100 = 21.17%
Formula
Percentage change = [(830 - 685) / 685] x 100
Subtract the new number by the original number
830 - 685 = 145
145 ÷ 685 = 0.2116788321167883
0.2116788321167883 x 100 = 21.17%