The following is a linear trend fitted to a series expressed in thousands of dollars. T=325.8+0.55t, where t is expressed in years. a. If we assume that the series is a flow variable, what is the value of the trend in October 1983 in thousands of dollars? Round your answer to the nearest second decimal. Tt = b. Using the above trend equation, what is the trend value for the third quarter of 1980 in thousand of dollars? Round your answer to the nearest second decimal. Tt = c. Using the above trend equation, what is the annual variation of the trend in dollars? Tt =