30.77% is the change from 650 to 850
Calculation steps:
[( 850 - 650 ) ÷ 650] x 100 = 30.77%
Formula
Percentage change = [(850 - 650) / 650] x 100
Subtract the new number by the original number
850 - 650 = 200
200 ÷ 650 = 0.3076923076923077
0.3076923076923077 x 100 = 30.77%