and how do i know sales price per unit? tq

5. Rolls Enterprise uses a raw material A12 for its stationery business. During the 3 months period ending March 2020, the following quantities of raw material A12 were received into, and issued out of, inventory as follows: Receipts Issues (Unit) (Unit) Date Purchase cost RM 7,200 XOXO 710 300 450 6 Jan 18 Jan 20 Jan 8 Feb 23 Feb 24 Feb 28 Feb 16 March 22 March 23 March 3,000 4.680 1,300 100 625 2.400 200 400 4.800 440 180 2,520 Required: Calculate the value of the closing inventory of material A12 at the end of each of the three months for Year 2020 using: a. FIFO method b. Perpetual weighted average price method