Do only problem number $21.$

Problems $19$ through $21$ should be viewed as independent situations. They are based on the following data:

Chapman Company obtains $100$ percent of Abernethy Company's stock on January $1,2017.$ As of that date, Abernethy has the following trial balance:

$\backslash$table$[[,$Debit,Credit$],[$Accounts payable,$$40,000,],[$Accounts receivable,,$50,000],[$Additional paid$-$in capital,$120,000,],[$Buildings $($net$)(4-$year remaining life$),60,000,],[$Cash and short$-$term investments,,$250,000],[$Common stock,$200,000,],[$Equipment $($net$)(5-$year remaining life$),90,000,],[$Inventory$,80,000,],[$Land$,,150,000],[$Long$-$term liabilities $($mature $12/31/20),,100,000],[$Retained earnings, $1/1/17,10,{000}_{?},],[$Supplies$,$$$600,{000}_{?},$$$600,{000}_{?}$