Tough Face, a manufacturer of rock-climbing gear, has been enjoying steady growth of its very reliable and colorful carabiner products. Using the following sales history, calculate the trend adjusted exponential smoothing forecast for the next three years. The growth trend appears to be 150 cases,∝ = 0.75 and β = 0.85.
Year 1 250
Year 2 369
Year 3 507
Year 4 658
Year 5 903