Incomplete records — practice question

Haziq has not kept complete accounting records for his business. For the year ended 31 July 2020, Haziq supplied the information below. On 1 August 2019 / On 31 July 2020 Bank loan $6000 / $4500 Inventory $8400 / ? Non-current assets at net book value $35580 / $32450 Rent prepaid $240 / - Trade payables $6280 / $7460 Wages accrued - / $610 Bank account summary for the year ended 31 July 2020 Sales receipts $166000 Balance c/d $6600 Balance b/d $2150 Payments to credit suppliers $96220 Bank loan repayments $1500 Bank loan interest $300 Rent $2640 Wages $41400 General expenses $10890 Drawings $17500 Further information 1 Gross margin was 40%. 2 Every sale was for cash and every cash receipt was banked.