How much does MIL + MIL add up?

How much does MIL + MIL add up?

Solve the following sum considering that each question mark represents a symbol that you must find:


The sum is made in Roman numerals:

Or what is the same: 1049 + 1049 = 2098.

One of the most common conceptual blocks is admittedly false, in which we take for granted more than what the statement specifically expresses. In this case, admitting simply that the symbols express digits closes the path to the solution.