Example: Fill in the blanks of the following

$\backslash$table$[[$Case$,$Revenues,$\backslash$table$[[$Variable$],[$Costs$]],\backslash$table$[[$Fixed$],[$Costs$]],\backslash$table$[[$Total$],[$Costs$]],\backslash$table$[[$Operating$],[$Income$]],\backslash$table$[[$Contribution$],[$Margin Percentage$]]],[$a$.,-,$$$500,-,$$$800,$$$1,200,-],[$b$.,$$$2,000,-,$$$300,-,$$$200,-],[$c$.,$$$1,000,$$$700,-,$$$1,000,-,-],[$d$.,$$$1,500,-,$$$300,-,-,40\%$