31.36% is the change from 491 to 645
Calculation steps:
[( 645 - 491 ) ÷ 491] x 100 = 31.36%
Formula
Percentage change = [(645 - 491) / 491] x 100
Subtract the new number by the original number
645 - 491 = 154
154 ÷ 491 = 0.3136456211812627
0.3136456211812627 x 100 = 31.36%