$1.$ Calculate weighted$-$average cost per unit. Assume that perpetual inventory records are kept in units only. $($Round answer to $2$ decimal places$)$

$2.$Compute the inventory at September $30$ on each of the following bases: FIFO, LIFO, Average$-$cost$.$ Assume that perpetual inventory records are kept in units only. $($Round average cost per unit to $2$ decimal places and final answers to $2$ decimal places$)$

$3.$ If the perpetual inventory record is kept in dollars, and costs are computed at the time of each withdrawal. what amount would be shown as ending inventory under: FIFI, LIFO, and average$-$cost$?($Round average cost per unit to $4$ decimal places and final answers to $2$ decimal places$)$