Can someone explain how I can estimate the percent of uncollectibles if all they give me are the totalsumbers

The Airdrie Employment Agency started business on January 1,2020 . The company produced monthly financial statements and had total sales of $560,000 (of which $448,000 was on account) during the first four months. On April 30, Accounts Receivable had a balance of $230,552 (no accounts have been written off to date), which was made up of the following accounts aged according to the date of the sale: (Click the icon to view the aging-of-accounts-receivable table.) (Click the icon to view the accounts receivable transactions.) Required Allowance tor vouptrul Accounts Now, we need to calculate the allowance for doubtful accounts by month. Start by selecting the estimated percent uncollectible percentage for the given month. Accounts Recievable Transactions The following accounts receivable transactions took place in May 2020: May 12 Decided the Post Courier account was uncollectible and wrote it off. 15 Collected $8,200 from Gallant Distributors for sales made in the first three months. 21 Decided the Pax Americana Solutions account was uncollectible and wrote it off. 24 Collected $2,600 from Nao Design for sales in the month of January. 26 Received a cheque from Pax Americana Solutions for $17,100 plus four cheques of $3,600 each, post-dated to June 26, July 26, August 26, and September 26 . 31 Total sales in the month were $380,000;85 percent of these were on account, and 70 percent of the sales on account were collected in the month. To calculate the allowance for doubtful accounts, take the totals for the month multiplied by estimated unco accounts to the nearest dollar.)