Help with combinations

Okay, so I get the process of combining arks into one. But what level is the new ark at? And what is it’s rank? E, D, C, B, A, or S? Or doe the rank depend on the monsters that where combined?
Does* were*

Both the level and grade will be an average of the two arks you fuse.

For example, say you combine a level 80 and level 40. The result will be a level 60 ark.

Say they were an A rank and E rank. The result will be C. If you combine two arks with grades that would result in the middle of two letters, you round up to the better grade.

That means the only way to get the S rank of something would be to have a few S ranked parts. Thanks Crystal

Either S+S or S+A would give you an S-graded ark.