Using the table, what is the average daily balance of the credit card for the October $1-$ October $31$ billing period? Round your answer to the nearest cent.

$\backslash$table$[[$Day Activity,Adjustment,Closing Balance,$],[1,-,--,10,000],[11,$Payment,$-2,000,8,000],[21,$Purchase,$+1,500,9,500],[31,$Purchase,$+1,000,10,500]]$