Please show the steps on how to do it on excel, thank you!

Weekly demand figures at Hot Pizza are as shown. 10 11 12 13 14 15 16 17 18 19 20 Week 10 11 12 Demand ($) 108 116 118 124 96 119 96 102 112 102 92 91 Estimate demand for the next 4 weeks using a exponential smoothing with a = 0.1 and a = 0.9. What difference in forecasts 21 do you observer? Which of the two smoothing constants do you prefer? Support your answers with graphs. 22 23