21.05% is the change from 646 to 782
Calculation steps:
[( 782 - 646 ) ÷ 646] x 100 = 21.05%
Formula
Percentage change = [(782 - 646) / 646] x 100
Subtract the new number by the original number
782 - 646 = 136
136 ÷ 646 = 0.21052631578947367
0.21052631578947367 x 100 = 21.05%