Hello, I need help with the following questions. I've altered the numbers and percentages to comply with the honor code. I simply need to understand how to solve these questions.

Q1. Calistoga Produce estimatesuncollectibleaccountstobe 3% of accounts receivable. The company reported accounts receivable and allowance for uncollectible accounts of $471,000 and $14,130, respectively, at December 31, 2016. During 2017, Calistoga's credit sales and collections were $915,000 and $891,000, respectively, and $11,720 of accounts receivable were written off.

Calistoga's bad debt expense for the year ended December 31, 2017, is: