Rachel should not answer, “That`s fine for me,” because it`s not idiomatic preposition that can be used in this context. Rachel, however, could say: “Fine by me” is very common, familiar, perhaps a little slangy. It is (I believe) wedged on Yiddish and entered English by Jewish slang. “Fine with me” is also very common and not stylistically marked. The project is in order with me – I`m OK with the project available or forward. We can also say “agree” – verb, for the action that results from the agreement: the employees – n. a person who works at the place where you work: someone with whom you work In this example, a speaker uses ok to show that she recognizes what the other speaker is saying. It also uses it to be consistent. The project is good for me – The current status or progress of the project is ok. I`m already ok with the project (or maybe I`m not and I hate working on this project).
X is good for me and means you approve of how something looks or is. But you can`t use that to allow an event or something that happens. Never use “them” with names of countries, states or cities. X goes well with me means you`re ok with something. The details of the contract, as defined in your document, are acceptable to me. The last example makes me think it was written by my teenage son. The environment is not bad, but what is “end”? The first makes it clear that the details are achievable, the treaty can go ahead. We can say “I agree with you” or “I agree with you” (formal). “Fine with me” is more formal than “Fine by me,” but just a little. We often find this expression good for me after verbs like sounds or glances. In a commercial sense, I would probably use the word “acceptable.” “Fine by me” and “fine with me” are more common words.
However, Americans often use well, even if they do not necessarily agree. Consider the same situation in a restaurant. They are also used as speech markers – words that organize a conversation. These words show transitions, agreements, disagreements, etc. Once again, the goal is to recognize what another person is saying. The speakers may disagree on what to eat, but one speaker uses it well to show that she understands what the other speaker is saying. “Rachel, we`re thinking about what you`re starting piano lessons next fall.” Adverbs are often used to indicate time, place or manner. So an employee might say, “The boss is fine with this project.” This statement does not praise the new boss.
That means there`s nothing remarkable about the new boss. He or she`s fine, not big and not bad.