51.86% is the change from 646 to 981
Calculation steps:
[( 981 - 646 ) ÷ 646] x 100 = 51.86%
Formula
Percentage change = [(981 - 646) / 646] x 100
Subtract the new number by the original number
981 - 646 = 335
335 ÷ 646 = 0.5185758513931888
0.5185758513931888 x 100 = 51.86%