31% is the change from 642 to 841
Calculation steps:
[( 841 - 642 ) ÷ 642] x 100 = 31%
Formula
Percentage change = [(841 - 642) / 642] x 100
Subtract the new number by the original number
841 - 642 = 199
199 ÷ 642 = 0.3099688473520249
0.3099688473520249 x 100 = 31%