Welcome to the forum, AK. Request you to post standalone queries in this thread: Investing Basics - Feel free to ask the most basic questions (It used to be pinned earlier, but now it’s not - so I understand the confusion).
Coming to your question - there are three approaches:
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If you’re considering the interest / Dividends / Capital Gains earned from the Cash, you can add it to FCFE and discount it together. Don’t include the Book Value Cash amount. That would lead to Double Counting.
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If you think a Cash position doesn’t have the same Risk as the Business (It doesn’t in my opinion), you can ignore the interest / Dividends / Capital Gains earned from the Cash from FCFE and add the Book Value Cash amount to the final Value.
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If you agree with #2 above, but think the management is wasting / hoarding / not reinvesting the Cash properly, you can mark it down by some amount just to be safe. Let’s say the Cash is earning 9%, but the Business is earning a 15% RoCE, you can mark it down by 40% (1-0.09/0.15). Of course, this is only if you are convinced that the management will only earn 9% on Cash for a long time and won’t be able to reinvest in the Business at 15% or return the Cash as Dividends/Buybacks.