How do I solve for this?

PROBLEM 1: Alabasta Company determined that the net realizable value of its accounts receivable at December 31, 2020, based on an aging of the receivables, was P365,625. Additional information is as follows: Allowance for uncollectible P33,750 accounts - 1/1/20 Uncollectible accounts written 20,250 off during 2020 Uncollectible accounts 2,250 recovered during 2020 Accounts receivable at 13/31/20 393,750 For 2020, what would be Alabasta's uncollectible accounts expense