Jammer Company uses a weighted average perpetual inventory system and reports the following:

August $2$

August $18$

August $29$

August $31$

Purchase

Purchase

Sale

Purchase

$17$ units at $$15\mathrm{.}00$ per unit.

$19$ units at $$13\mathrm{.}00$ per unit.

$34$ units.

$22$ units at $$18\mathrm{.}00$ per unit.

What is the per$-$unit value of ending inventory on August $31?($Round your per unit answers to $2$ decimal places.$)$

$$17\mathrm{.}66$

$$18\mathrm{.}00$

$$15\mathrm{.}00$

$$19\mathrm{.}14$

$$13\mathrm{.}94$