Bridgeport Corp. had record sales in 2017. It began 2017 with an Accounts Receivable balance of $570,000 and an Allowance for Doubtful Accounts of $40,000. Bridgeport recognized credit sales during the year of $8,010,000 and made monthly adjusting entries equal to 0.5% of each months credit sales to recognize bad debt expense. Also during the year, the company wrote off $42,600 of accounts that were deemed to be uncollectible, although one customer whose $4,800 account had been written off surprised management by paying the amount in full in late September. Including this surprise receipt, $7,882,200 cash was collected on account in 2017. In preparation for the audited year-end financial statements, the controller prepared the following aged listing of the receivables at December 31, 2017:

Days Account Outstanding		Amount		Probability of Collection
Less than 16 days		$324,000		97%
Between 16 and 30 days		140,000		92%
Between 31 and 45 days		96,000		80%
Between 46 and 60 days		46,000		70%
Between 61 and 75 days		24,000		50%
Over 75 days		30,000		0%
		$660,000

QUESTION: Reconcile the 2017 opening balance in Accounts Receivable to the $660,000 ending balance on the controllers aged listing.