$7\mathrm{.}3$ Which Cost Flow Assumption to Adopt?

The acquisition cost of a heavily used raw material changes frequently. The inventory amount of this material at year end will be the

same if perpetual records $($units and costs$)$ are kept as it would be under a periodic inventory method only if the inventory amount is

computed under which of the following methods?

weighted$-$average method

first$-$in$,$ first$-$out method

direct costing method

last$-$in$,$ first$-$out method