For the following dataset (Port entry into Detroit), construct the multiplicative seasonal model and predict the monthly truck flow for the year 2020 (All 12 months) - 9 points i) We need the seasonal indices ii) We need the final forecasting model iii) We need the forecast for the next twelve months iv) What is the WMAPE for the model? (Note : Only MAD and MAPE are given by Minitab- we need WMAPE)