I can't seem to pinpoint where I have gone wrong. I have checked the numbers multiple times but can't find my error. Please help

Paul's Pool Service provides pool cleaning, chemical application, and pool repairs for residential customers. Clients are billed weekly for services provided and usually pay 60 percent of their fees in the month the service is provided. In the month following service, Paul collects 35 percent of service fees. The final 5 percent is collected in the second month following service. Paul purchases his supplies on credit, and pays 50 percent in the month of purchase and the remaining 50 percent in the month following purchase. Of the supplies Paul purchases, 80 percent is used in the month of purchase, and the remainder is used in the month following purchase. The following information is available for the months of June, July, and August, which are Paul's busiest months: June 1 cash balance $16,100. June 1 supplies on hand $4,300. June 1 accounts receivable $9,000. June 1 accounts payable $4,200. Estimated sales for June, July, and August are $27,000, $40,500, and $43,000, respectively. Sales during May were $25,000, and sales during April were $18,000. Estimated purchases for June, July, and August are $10,000, $19,000, and $13,500, respectively. Purchases in May were $5,500. Required 1 Required 2 >> XIX Compute the balances necessary to prepare a budgeted balance sheet for August 31 for each of the following accounts: Balances for August 31 Budgeted Balance Sheet Cash June 1 Balance $ 16,100 Add: Total Cash Receipts 102,175 Less: Total Cash Payments 30,750 August 31 Balance $ 87,525 Supplies Inventory 20% of August Purchases 2,700 Accounts Receivable 40% of August Sales $ 17,200 5% of July Sales 1,350 Balance at August 31 18,550 Accounts Payable 50% of August Purchases 6,750 $ $