9.46% is the change from 666 to 729
Calculation steps:
[( 729 - 666 ) ÷ 666] x 100 = 9.46%
Formula
Percentage change = [(729 - 666) / 666] x 100
Subtract the new number by the original number
729 - 666 = 63
63 ÷ 666 = 0.0945945945945946
0.0945945945945946 x 100 = 9.46%