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Paolucci Corporation's relevant range of activity is $6,600$ units to $14,000$ units. When it produces and sells $10,300$ units, its average costs per unit are as follows:

Average Cost per Unit

Direct materials $ $6\mathrm{.}80$

Direct labor $ $3\mathrm{.}70$

Variable manufacturing overhead $ $1\mathrm{.}70$

Fixed manufacturing overhead $ $3\mathrm{.}10$

Fixed selling expense $ $1\mathrm{.}00$

Fixed administrative expense $ $0\mathrm{.}70$

Sales commissions $ $0\mathrm{.}95$

Variable administrative expense $ $0\mathrm{.}60$

If $9,300$ units are sold, the variable cost per unit sold is closest to:

Multiple Choice

$$18\mathrm{.}55$

$$12\mathrm{.}20$

$$15\mathrm{.}30$

$$13\mathrm{.}75$