purchased dental equipment at 15,000 and invested cash of 500,000

There is no question here.

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I'm assuming you need to journalize these transactions.

Dr. Equipment $15,000
Cr. Cash (or Accounts Payable if you're buying on credit) $15,000

Dr. Cash $500.000
Cr. Owner's Capital $500,000

Your debits and credits must always balance in the end. I can show you an easy way to understand and remember how to determine which side to debit and which to credit. Good luck!

To calculate the total investment, you need to add the amount spent on dental equipment and the cash investment. In this case, the dental equipment cost $15,000, and the cash investment was $500,000.

Total investment = Dental equipment cost + Cash investment
= $15,000 + $500,000
= $515,000

Therefore, the total investment made was $515,000.