The salvage value S (in dollars) of a company jet after t years is estimated to be given by the formula below. Use the formula to answer the questions S(t) = 300,000(0.8) What is the rate of depreciation (in dollars per year) after 1 year? per year (Do not round until the final answer. Then round to the nearest cent as needed.) What is the rate of depreciation (in dollars per year) after 10 years? per year (Do not round until the final answer, Then round to the nearest cent as needed ) What is the rate of depreciation (in dollars per year) after 15 years? $ per year (Do not round until the final answer. Then round to the nearest cent as needed.)