Solve for the missing amounts for the following separate cases.

$\backslash$table$[[$Case$,\backslash$table$[[$Sales price$],[$per unit$]],\backslash$table$[[$Variable costs$],[$per unit$]],\backslash$table$[[$Total$],[$Fixed costs$]],\backslash$table$[[$Break$-$even$],[$in units$]],],[1,$$$20,$$$,16,$$$,40,000,],[2,25,5,,,5,000,],[3,30,,,81,000,9,000,],[4,,,4,48,000,8,000,]]$