Please answer the questions 18.7, 18.8 and 18.9 with your detailed explanations, it's much appreciated!

The trial balance of Z failed to agree, the totals being: A suspense account was opened for the amount of the difference and the following errors were found and corrected: (1) The total of the cash discount received column in the cash book had not been posted to the discount received account. The figure for discounts received was $5,100. (2) A cheque for $19,000 received from a customer was correctly entered in the cash book but was posted to the control account as $9,100. What will the remaining balance be on the suspense account after the correction of these errors? $ credit 3.8 The trial balance of C, a limited liability company, did not agree, and a suspense account was opened for the difference. Checking in the bookkeeping system revealed a number of errors. Which TWO of the following errors would require an entry to the suspense account as part of the process of correcting them? $4,600 paid for motor van repairs was correctly treated in the cash book but was credited to motor vehicles asset account. $360 received from B, a customer, was credited in error to the account of BB. $9,500 paid for rent was debited to the rent account as $5,900. Sales returns had been debited in error to the purchases returns account. No entries have been made to record a cash sale of $100. 3.9 The suspense account shows a debit balance of $100. What could this balance be due to? Entering \$50 received from A Turner on the debit side of A Turner's account Entering $50 received from A Turner on the credit side of A Turner's account Undercasting the sales day book by $100 Undercasting the purchases account by $100