Billy said that the depreciation value S(in dollars) of his upgraded Rav4 after t years can be modeled by S(t) = 28000 (0.8)t.What is the rate of depreciation after 1 year?Write your answer to two decimal places.Billy said that the depreciation value S(in dollars) of his upgraded Rav4 after t years can be modeled by S(t)= 28000 (0.8)t.What is the rate of depreciation after 5 years?Write your answer to two decimal places.