$1$ Mojo Industries tracks the number of units purchased and sold throughout each accounting period but applies its inventory costing method at the end of each period, as if it uses a periodic inventory system. Assume its accounting records provided the following information at the end of the accounting period, January $31.$ The inventory's selling price is $$10$ per unit.

$\backslash$table$[[$Iransactions$,\backslash$table$[[$Unit$],[$cost$]],$Units,Total,cost