PQR Ltd. found that an extra capital of $21,000 paid into the bank had been credited to Sales. Goods taken for own use worth $1,300 had been debited to General Expenses. Private insurance of $140 had been debited to the Insurance account. A purchase of goods from K. Turner for $910 was entered in the books as $810. Cash banked of $520 was credited to the bank column and debited to the cash column in the cash book. Cash drawings of $570 had been credited to the bank column of the cash book. Returns inwards of $280 from R. Ward had been entered in error in G. Parker’s account. A sale of office furniture for $2,600 had been credited to Office Expenses.
 Requirement: Provide the necessary journal entries to correct these errors and analyze their effect on the net profit.