Sales over the past 10 years are shown below. Using the method of least squares, calculate the values of a and b to complete this regression equation. Year Sales 1 000 'T 1, 470 W /N 1, 070 4 1, 990 5 1 , 850 6 1 , 230 1, 920 1, 430 1, 810 1, 350 (Indicate a negative answer using a "-" sign. Do not round intermediate calculations and round your answer to 3 decimal places.) Sales= + 39.394 X What is your forecast for next year's sales? (Do not round intermediate calculations and round your answer to 2 decimal places.) Sales= 1,243.00