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

$\backslash$table$[[$Date$,$Activities,Units Acquired at Cost,Units Sold at Retail$],[$August $2,$Purchase,$10$ units @ $$17=$$$170,],[$August $18,$Purchase,$15$ units @ $$20=$$$300,],[$August $29,$Sales,,$],[$August $31,$Purchase,$14$ units @ $$21=$$$294,]]$

What is the per unit value of ending inventory on August $31?$ Answers should be rounded to the nearest cent.

Multiple Choice

$$21\mathrm{.}00$

$$22\mathrm{.}52$

$$18\mathrm{.}80$

$$20\mathrm{.}42$

$$17\mathrm{.}00$