Yeatman Co$.$ is considering an investment that will have the following sales, variable costs, and fixed operating costs:

$\backslash$table$[[,$Year $1,$Year $2,$Year $3,$Year $4],[$Unit sales,$4,200,4,100,4,300,4,400],[$Sales price,$$29\mathrm{.}82,$$$30\mathrm{.}00,$$$30\mathrm{.}31,$$$33\mathrm{.}19$