Lama atem mochrim et mis'adoteichem
Does the answer have to use the plural 'you' form? My answer with אתה instead of אתם (and appropriate verb and other endings) was marked wrong.
My understanding is that the possessive suffixes are commonly used only for certain words. It's מסעדה one of them?
So "for what" can't be used synonymously with "why"? As in: What are you selling your restaurants for. Or is it just that it doesn't sound natural?
בשביל מה אתן מוכרות את המסעדות שלכן?
your sentence is fine. It sounds natural in Hebrew.
Why is it necessary to us את before מסעדותכם in this sentence.