Please help! im not sure how to do the ones that ask to estimate

Required information (The following information applies to the questions displayed below.) The following events occur for Morris Engineering during 2018 and 2019, its first two years of operations. February 2, 2018 Provide services to customers on account for $35,000 July 23, 2018 Receive $24,500 from customers on account. December 31, 2018 Estimate that 20% of uncollected accounts will not be received. April 12, 2019 Provide services to customers on account for $48,000. June 28, 2019 Receive $6,000 from customers for services provided in 2018. September 13, 2019 Write off the remaining amounts owed from services provided in 2018. October 5, 2019 Receive $42,500 from customers for services provided in 2019. December 31, 2019 Estimate that 20% of uncollected accounts will not be received Required: 1. Record transactions for each date. (If no entry is required for a transaction/event, select "No journal entry required" in the first account field.) View transaction list Journal entry worksheet Write off the remaining amounts owed from services provided in 2018. Note: Enter debits before credits General Journal Debit Credit Date Sep. 13, 2019 Record entry Clear entry View general Journal Required: 1. Record transactions for each date. (if no entry is required for a transaction/event, select "No journal entry required" in the first account field.) View transaction list Journal entry worksheet