What will come in the place of question (?) mark in following the question:

$4.5\times 8+31.6+?=400$

The correct option is 332.4.

To find the value that replaces the question mark (?), we can represent it with the variable $x$ and write the equation as:

$4.5\times 8+31.6+x=400$

We can solve for $x$ step-by-step using the order of operations (BODMAS/PEMDAS):

Step 1: Perform the multiplication first.
Multiply $4.5$ by $8$:
$4.5\times 8=36$

Substitute this value back into the equation:
$36+31.6+x=400$

Step 2: Add the numbers on the left-hand side.
Add $36$ and $31.6$:
$36+31.6=67.6$

This simplifies our equation to:
$67.6+x=400$

Step 3: Isolate the variable $x$.
Subtract $67.6$ from both sides of the equation to find the value of $x$:
$x=400-67.6$
$x=332.4$

Therefore, the value that must come in place of the question mark is 332.4.