Using the following excerpts from the most recent annual report of WooHoo, a high technology firm, analyze the accounts receivable and allowance for doubtful accounts. Be sure to show all calculations and write a thorough interpretation of those calculations. (dollars in millions) Net sales Accounts receivable less allowance for doubtful accounts of $22 at April 30, 2015 and $40 April 30, 2014 Allowance for doubtful accounts 2015 2014 2013 WooHoo Valuation And Qualifying Accounts For the Years Ended April 30, 2015, 2014 and 2013 Balance at beginning of period $40 $51 $46 Charged to Deduction expenses S $5 $4 $25 2015 2014 $7,20 $6,400 0 ($23) ($15) ($20) $1,00 $1,030 0 Balance at end of period $22 $40 $51