单项选择题

A company's policy is to charge depreciation on plant and machinery at 20% per year on cost, with proportional depreciation for items purchased or sold during a year. The company's plant and machinery at cost account for the year ended 30 September 20X3 is shown below.
                                   PLANT AND MACHINERY – COST
20X2                                              20X3
1 Oct Balance             200,000      30 Jun Transfer-
20X3                                              disposal account     40,000
1 Apr Cash-                                   20X3
purchase of plant       50,000        30 Sep Balance      210,000
                                  250,000                                      250,000
What should be the depreciation charge for plant and machinery (excluding any profit or loss on the disposal) for the year ended 30 September 20X3?
A、51,000
C、45,000