Tough Face, a manufacturer of rock-climbing gear, been enjoying steady growth of it very reliable and colourful carabineer products. Using the following sales history, calculate the trend-adjusting exponential smoothing forecast for the next three years. the growth trend appears to be 150 cases, %u221D =0.75, and %u03B2= 0.85.
Year1 250
Year 2 369
Year 3 507
Year 4 658
Year 5 903