The following transactions occurred over the months of September to December 2011 at Nicole's Getaway Spa (NGS).
September Sold spa merchandise to Ashley Welch Beauty for $1,800 on account; the cost of these goods to NGS was $900.
October Sold merchandise to Kelly Fast Nail Gallery for $450 on account; the cost of these goods to NGS was $200.
November Sold merchandise to Raea Gooding Wellness for $300 on account; the cost of these goods to NGS was $190.
December Received $1,200 from Ashley Welch Beauty for payment on its account
Estimate the Allowance for Doubtful Accounts required at December 31, 2011, assuming NGS uses the aging of accounts receivable method with the following uncollectible rates: one month, 2%; two months, 6%; three months, 20%; more than three months, 35%.