3.29% is the change from 850 to 878
Calculation steps:
[( 878 - 850 ) ÷ 850] x 100 = 3.29%
Formula
Percentage change = [(878 - 850) / 850] x 100
Subtract the new number by the original number
878 - 850 = 28
28 ÷ 850 = 0.03294117647058824
0.03294117647058824 x 100 = 3.29%