35.3% is the change from 643 to 870
Calculation steps:
[( 870 - 643 ) ÷ 643] x 100 = 35.3%
Formula
Percentage change = [(870 - 643) / 643] x 100
Subtract the new number by the original number
870 - 643 = 227
227 ÷ 643 = 0.35303265940902023
0.35303265940902023 x 100 = 35.3%