47.91% is the change from 670 to 991
Calculation steps:
[( 991 - 670 ) ÷ 670] x 100 = 47.91%
Formula
Percentage change = [(991 - 670) / 670] x 100
Subtract the new number by the original number
991 - 670 = 321
321 ÷ 670 = 0.4791044776119403
0.4791044776119403 x 100 = 47.91%