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At 31 December 2019 the unadjusted balance in allowance for doubtful debts is a credit of $10000. Required (a) Journalise and post the adjusting entry for bad debts at 31 December 2019. (b) Journalise and post to the allowance account these 2020 events and transactions. (Use running-balance format.) 1. 1 March, a $600 customer balance originating in 2020 is judged uncollectable. 2. 1 May, a cheque for $600 is received from the customer whose account was written off as uncollectable on 1 March (c) Journalise the adjusting entry for bad debts at 31 December 2020, assuming that the unad justed balance in allowance for doubtful debts is a debit of $1100 and the ageing schedule of accounts receivable indicates that total estimated bad debts will be $29 100