What will come in place of the question mark (?) in the following equation, if ‘+’ and ‘−’ are interchanged and ‘×’ and ‘÷’ are interchanged?
52 ÷ 15 − 189 × 9 + 117 = ?​

52 ÷ 15 − 189 × 9 + 117 = ?

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

 New Expression: 52 × 15 + 189 ÷ 9 − 117 = ?

52 × 15 + 21 −117 = ?

52 × 15 + 21 −117 = ?

780 + 21 −117 = ?

801 − 117 = ?

Thus, correct option is (a).