51.01% is the change from 643 to 971
Calculation steps:
[( 971 - 643 ) ÷ 643] x 100 = 51.01%
Formula
Percentage change = [(971 - 643) / 643] x 100
Subtract the new number by the original number
971 - 643 = 328
328 ÷ 643 = 0.5101088646967341
0.5101088646967341 x 100 = 51.01%