Fill in the missing data for each of the following independent cases. $($Ignore income taxes.$)($Do not round intermediate calculations. Leave no cells blank $-$ be certain to enter $"$O$"$ wherever required.$)$

$\backslash$table$[[,$Sales Revenue,Variable Expenses,$\backslash$table$[[$Total Contribution$],[$Margin$]],$Fixed Expenses,Net Income,$\backslash$table$[[$Break$-$Even Sales$],[$Revenue$]]],[1.,,81,000[,,64,800,,81,000],[2.,140,000,-,31,000,,-,140,000],[3.,,120,000,240,000,,140,000,],[4.,50,000,10,000,,,19,100,]]$