For questions $1-4,$ solve for the unknown variables $($identified with a $?)$ based on the information provided. $"$N$/$A$"$ indicates that the particular variable is not applicable in the question.

$\backslash$table$[[,\backslash$table$[[$List Price or$],[$MSRP$]],\backslash$table$[[$First$],[$Discount$]],\backslash$table$[[$Second$],[$Discount$]],\backslash$table$[[$Third$],[$Discount$]],\backslash$table$[[$Net$],[$Price$]],\backslash$table$[[$Equivalent Single$],[$Discount Rate$]],\backslash$table$[[$Total$],[$Discount$],[$Amount$]]],[1.,$$$980\mathrm{.}00,42\%,$N$/$A$,$N$/$A$,?,$N$/$A$,?],[2.,?,25\%,$N$/$A$,$N$/$A$,$$$600\mathrm{.}00,$N$/$A$,?],[3.,$$$1,975\mathrm{.}00,25\%,15\%,10\%,?,?,?$