Which two signs need to be interchanged to make the following equation correct?

36 + 6 ÷ 3 - 20 × 5 = 50

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

36 + 6 ÷ 3 - 20 × 5 = 50

Check each options:

= 36 - 2 + 20 × 5 = 50

= 36 - 2 + 100 = 50

= 136 - 2 = 50

= 36 + 6 − 0.15 × 5 = 50

= 36 + 6 − 0.75 = 50

= 42 -0.75 = 50

= 36 + 18 − 4 = 50

= 54 - 4 = 50

= 36 × 2 - 20 + 5 = 50

= 72 + 5 - 20 = 50

= 77 - 20 = 50

Thus, the correct option is: (c)