54.06% is the change from 640 to 986
Calculation steps:
[( 986 - 640 ) ÷ 640] x 100 = 54.06%
Formula
Percentage change = [(986 - 640) / 640] x 100
Subtract the new number by the original number
986 - 640 = 346
346 ÷ 640 = 0.540625
0.540625 x 100 = 54.06%