19.71% is the change from 685 to 820
Calculation steps:
[( 820 - 685 ) ÷ 685] x 100 = 19.71%
Formula
Percentage change = [(820 - 685) / 685] x 100
Subtract the new number by the original number
820 - 685 = 135
135 ÷ 685 = 0.19708029197080293
0.19708029197080293 x 100 = 19.71%