9.1% is the change from 670 to 731
Calculation steps:
[( 731 - 670 ) ÷ 670] x 100 = 9.1%
Formula
Percentage change = [(731 - 670) / 670] x 100
Subtract the new number by the original number
731 - 670 = 61
61 ÷ 670 = 0.09104477611940298
0.09104477611940298 x 100 = 9.1%