depreciation accounting

there is a question .. according to which the cost of the assest is 100000 ... useful life is 5 years and expected scrap value is 2000 .... depreciation to be charged under slm   ... what is the rate ?

2) and what is the depreciation to be charged for 3 rd year ?

according to be the rate is 19.6 and depreciaton is 19600 for 3 year ..

but in the material it is given the rate is 20 and depreciation is  19600 for third year 

please clarify whether i am right ??