34.67% is the change from 646 to 870
Calculation steps:
[( 870 - 646 ) ÷ 646] x 100 = 34.67%
Formula
Percentage change = [(870 - 646) / 646] x 100
Subtract the new number by the original number
870 - 646 = 224
224 ÷ 646 = 0.34674922600619196
0.34674922600619196 x 100 = 34.67%