20.3% is the change from 670 to 806
Calculation steps:
[( 806 - 670 ) ÷ 670] x 100 = 20.3%
Formula
Percentage change = [(806 - 670) / 670] x 100
Subtract the new number by the original number
806 - 670 = 136
136 ÷ 670 = 0.20298507462686566
0.20298507462686566 x 100 = 20.3%