Answer:
Gross profit for January = $786
Explanation:
Particulars Units Rate Amount
Sales on 19th 24 $28 $672
Sales on 27th 27 $32 $864
Closing Balance 6 $17 $102
Total $1,638
Particulars Units Rate Amount
Opening 18 $13 $234
Purchases on Jan 12th 15 $14 $210
Purchases on Jan 20th 24 $17 $408
Gross Profit $786
Total $1,638