(Table) The table shows the demand of three individuals in a market. Assuming they are the only buyers, what is total market quantity demanded if the price is $20? 
Definitions:
Allowance for Doubtful Accounts
A contra-asset account used to estimate the portion of accounts receivable that may not be collectible.
Personal Insolvency
A financial condition where an individual is unable to meet their debt obligations as they come due.
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