B acquired a lorry on $1$ May $20$X$0$O at a cost of $$30,000.$ The lorry has an estimated useful life of four years, and an estimated resale value at the end of that time of $$6,000.$ B charges depreciation on the straight line basis, with a proportionate charge in the period of acquisition.What will the depreciation charge for the lorry be in B$\text{'}$s accounting period to $30$ September $20$X$\mathrm{0?}$