Materials issued from stores are valued based on their carrying cost, and entries are made in the store's ledger upon each receipt. Materials are recorded at their actual cost, and different lots may $.$ be received at varying prices.

The following transactions occurred in September $2001$:

$\backslash$table$[[$Date$,$Details,Quantity $($liters$),$Rate $($RM$)],[1$ Sept,Opening Stock,$300,9\mathrm{.}70],[5$ Sept,Purchase,$250,9\mathrm{.}80],[9$ Sept,Sold,$400,-],[14$ Sept,Purchase,$300,10\mathrm{.}00],[16$ Sept,Sold,$200,-],[25$ Sept,Purchase,$150,10\mathrm{.}00],[26$ Sept,Sold,$150,-]]$

Required:

$($a$)$ Calculate the consumption value of the materials issued during September using the First $ln,$ First Out $($FIFO$)$ method. $(10$ marks$)$

$($b$)$ Determine the value of the closing stock as of $30$ September $2001$ using the FIFO method. $(5$ marks$)$