19.4% is the change from 670 to 800
Calculation steps:
[( 800 - 670 ) ÷ 670] x 100 = 19.4%
Formula
Percentage change = [(800 - 670) / 670] x 100
Subtract the new number by the original number
800 - 670 = 130
130 ÷ 670 = 0.19402985074626866
0.19402985074626866 x 100 = 19.4%