Please read links in there such as “how to calculate payments” and other helpful articles.
It might seem like a lot but TBH there are fewer <60 minute exercises which will save you so much time, money and anxiety over your driving lifetime.
It may also save you (after your negotiations with LH input) inside the finance office where no one can from the internet can really help you.
Remember, it’s almost impossible to reverse-engineer the math starting from the output (monthly payment) and figure out if it’s a good deal. Start at the beginning.
I recently turned in a C300 with 4 months left and several thousand in positive equity that I used as leverage to get a decent deal.
Have a look at KBB, Carvana, Vroom, etc. See how much your car might be worth, then go online to MBFS and see what your buyout would cost. If your buyout is less than the average of what your vehicle is worth, your vehicle might appeal to the dealership.
Check the used section of the MB dealers you intend to target for your new lease. If their inventory is rather low, they might be more willing to give you a decent deal so they can buy your C300 from MBFS.