Calistoga Produce estimates bad debt expense at 0.20% of credit sales. The company reported accounts receivable and allowance for uncollectible accounts of $482,000 and $1600 respectively, at December 31, 2017. During 2018, Calistoga's credit sales and collections were $332,000 and $319,000, respectively, and $1880 in accounts receivable were written off. Calistoga's 2018 bad debt expense is: $638. $484. $664. $1700. None of the above