Details concerning that activity$-$based costing system are listed below:

$\backslash$table$[[$Activity Cost Pool,Activity Measure,Activity Rate$],[$Supporting assembly,Direct labor$-$hours $($DLHs$),$$$3\mathrm{.}45$ per DLH$],[$Processing batches,Number of batches,$$193\mathrm{.}30$ per batch$],[$Processing orders,Number of orders,$$83\mathrm{.}05$ per order$],[$Serving customers,Number of customers,$$1,608\mathrm{.}00$ per customer$]]$

of this product are listed below:

$\backslash$table$[[$Number of units purchased,$1,500$ units$],[$Number of batches,$5$ batches$],[$Number of orders,$2$ orders$],[$Direct labor$-$hour requirement,$0\mathrm{.}25$ DLHs per unit$],[$Selling price,$$18\mathrm{.}55$ per unit$],[$Direct materials cost,$$8\mathrm{.}35$ per unit$],[$Direct labor cost,$$3\mathrm{.}95$ per unit$]]$

According to the activity$-$based costing system, the customer margin for this customer this past year was closest to:

Multiple Choice

$$15,300\mathrm{.}00$

$$9,375\mathrm{.}00$

$$5,340\mathrm{.}65$