Ativa Corporation's relevant range of activity is $4,000$ units to $8,000$ units. Ativa's average costs per unit, when it produces and sells $6,000$ units, are as follows: Direct materials Direct labor Variable manufacturing overhead Fixed manufacturing overhead Fixed selling expense Fixed administrative expense Sales commissions Variable administrative expense Average Cost per Unit $ $6\mathrm{.}45$ $ $3\mathrm{.}30$ $ $1\mathrm{.}25$ $ $3\mathrm{.}00$ $ $1\mathrm{.}05$ $ $0\mathrm{.}60$ $ $1\mathrm{.}00$ $ $0\mathrm{.}50$ If $5,000$ units are sold, the variable cost per unit sold is closest to: