Blue Llama Mining 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 $4],[$Sales $($units$),3,500,4,000,4,200,4,250],[$Sales price,$$38\mathrm{.}50,$$$39\mathrm{.}88,$$$40\mathrm{.}15,$$$41\mathrm{.}55$