If D means -, C means ×, F means ÷, B means +; then what will come in place of the question mark (?) in the following equation?

28 B 72 F 6 D 8 C 4 = ?

Given: 

​$$\begin{array}{|c|c|} \hline\textbf{Operation preference wise} & \textbf{Symbol} \\\hline\text{Brackets} &[],{}, () \\ \hline \text{Orders, of} & (power), √ (root) , of \\ \hline \text{Division}& ÷ \\ \hline \text{Multiplication} & × \\\hline \text{Addition} & + \\ \hline \text{Subtraction} & -\\\hline\end{array}$$​​

28 B 72 F 6 D 8 C 4 = ?

After interchanging following equation will be - 

= 28 +72 ÷ 6 – 8 × 4

= 28 +12 – 8 × 4