31.93% is the change from 642 to 847
Calculation steps:
[( 847 - 642 ) ÷ 642] x 100 = 31.93%
Formula
Percentage change = [(847 - 642) / 642] x 100
Subtract the new number by the original number
847 - 642 = 205
205 ÷ 642 = 0.31931464174454827
0.31931464174454827 x 100 = 31.93%