Based on the information given the balance in cash in march 6 is $12,090.
Cash received from owner $10,000
Less Paid rent ($1,000)
Less Purchased Equipment ($4,000)
Less Office Supplies ($710)
Received from client $7800
Cash balance on March 6 $12,090
Inconclusion the balance in cash in march 6 is $12,090.
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