Use the following to answer questions 20 22 At the beginning of the year; MB, Inc.'s allowance for uncollectible accounts had a beginning balance of $3,600. On January 22nd, MB wrote off the A/R from customer C for $200 20. Record the entry for write-off 21. $ _By the end of the year (December 31st); total accounts written off were $3,550 (including the write off for customer C). What is the balance in the allowance for uncollectible accounts after all the write- offs? 22. $ How much did bad debt expense change when the company wrote off the accounts receivables