Review Problem $-$ Perpetual & Periodic Inventory

$\backslash$table$[[$Date$,$Units,Price,Total cost$],[$Aug $1$ Beg Bal,$10,$$$91\mathrm{.}00,],[$Aug $3$ Purchase,$15,$$$106\mathrm{.}00,],[$Aug $14$ Sale,$20,$$$130\mathrm{.}00,x$