Perpetual Inventory Using LIFO

Beginning inventory, purchases, and sales for Item CZ$83$ are as follows:

$\backslash$table$[[$January $1,$Inventory,$84$ units @ $$30.$ January $5,$ Sale, $67$ units. january $11,$ purchase, $93$ units @ $$33.$ January $21,$ Sale, $78$ units. Using LIFO, determine a$)$ the cost of merchandise sold on january $21.$ B$)$ inventory on january $31.$