How to determine the value of an llc

I have a two-part question:

1. I need to know how to determine how many membership units should be issued for each member, including a new member.

I have an LLC with three members. Each member contributed the following: Member A, $30k for 75% interest, Member B, $15k for 5% interest, and Member C, $20k for 20% interest in the company. If a new investor comes in and contributes $200k for 35% interest, how many membership units should be issued to him w/o Member A losing control (less than 50% interest)?

1. How do I determine the value of the LLC? Is it merely the amount of capital contributed?

Ignoring the capital each member contributed and just going by the percentage of the membership each existing member has an interest in, if you are allocating 35% of the company to a new investor then each existing member needs to be scaled back by 35%.

That means A would get 48.75%, B would get 3.25% and C would get 13%. Add those to the new investor that has 35% and you're upto 100%. I don't see any other way of doing it if you are basing it on percentages.

This way member A would end up with less than half the company if you give away 35% of the company regardless of how much the new investor puts in.

without revenue - your capital contributed is the only means by which you could clearly base a valuation. however there are several ways to assess a member's value. i suggest reading through Dan Shapiro's thoughts here - http://www.geekwire.com/2011/wrong-answer-5050-calculating-cofounder-equity-split - for some creative rationale.

if you do have revenue - 10-15x of rev is an acceptable valuation. So $10K in rev becomes a company valued at $100K to $150K + $65K Founders + $200K investment = $365 - $415K total value. New member should get 54% - 48% in this case.