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

$90.5+30.1-5.4+?=120.3$

The correct option is 5.1.

To find the value that replaces the question mark (?), we can write the given expression as an algebraic equation:
$90.5+30.1-5.4+x=120.3$
where $x$ represents the unknown value (?).

Step 1: Simplify the terms on the left-hand side of the equation.
First, perform the addition:
$90.5+30.1=120.6$

Now, substitute this back into the equation:
$120.6-5.4+x=120.3$

Next, perform the subtraction:
$120.6-5.4=115.2$

This simplifies our equation to:
$115.2+x=120.3$

Step 2: Isolate the variable $x$ by subtracting $115.2$ from both sides of the equation:
$x=120.3-115.2$
$x=5.1$

Therefore, the value that should come in place of the question mark is 5.1.