31.77% is the change from 491 to 647
Calculation steps:
[( 647 - 491 ) ÷ 491] x 100 = 31.77%
Formula
Percentage change = [(647 - 491) / 491] x 100
Subtract the new number by the original number
647 - 491 = 156
156 ÷ 491 = 0.31771894093686354
0.31771894093686354 x 100 = 31.77%