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The businessman is figuring out what caused his business to be lost.

The businessman is finding out what caused his business to be lost.

Please check them

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kumenglishThe businessman is figuring out what has caused his business to make a loss. be lost.

"is figuring out" suggests he's doing that right at the time of speaking. "is trying to figure out" is more likely.

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See above for the second sentence.

You might also want to use "to go into the red". It means to make a loss.

Comments  

Figure out means to use reason to reach a logical answer

Find out means to learn or discover how something has happened.

I was trying to find out a way to reach that town.

I was figuring out what might have led him to take such a decision.

Now coming to your sentence, you can consider this:

The businessman was finding out/figuring out what (could have) caused loss in his business.

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kumenglish to be lost.

What do you mean by that?

vsuresh what (could have) caused loss in his business.

That's not correct.

I meant that the Business is losing or he is operating the business at loss So, he is finding out its reason.

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 teechr's reply was promoted to an answer.
kumenglish

The businessman is figuring out what caused his business to be lost.

The businessman is finding out what caused his business to be lost.

Please check them

A few suggestions in addition to those already suggested above.

The entrepreneur is trying to determine why his business failed.
....................................... trying to find out why his business failed.
....................................... trying to find the cause of his business failure.


Losing his business is not the same as operating his business at a loss.

CJ

The entrepreneur is trying to find the cause of his business failure and improve/recover it.

Please check the underlined verbs. Are they suitable here?

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kumenglish

The entrepreneur is trying to find the cause of his business failure and improve/recover it. recover from it.

Please check the underlined verbs. Are they suitable here?

You want 'recover', not 'improve'. As shown. We recover from a failure, so you need the word 'from' in there. Otherwise, fine.

CJ