amount of depreciation

From the following particulars, calculate the amount of depreciation for the year 20X1-20X2 and Written Down Value as at 31st March,20X2.
W.D.V. of Plant & Machinery as at 31st March, 20X1, $100000, New Machine acquired on 1st Oct, 20X1 for $200000. Old machine sold on 31st March for $50000. Rate of depreciation applicable to this block of machine is 15% p.a. on Written Down value.