26.87% is the change from 670 to 850
Calculation steps:
[( 850 - 670 ) ÷ 670] x 100 = 26.87%
Formula
Percentage change = [(850 - 670) / 670] x 100
Subtract the new number by the original number
850 - 670 = 180
180 ÷ 670 = 0.26865671641791045
0.26865671641791045 x 100 = 26.87%