could you solve it and explain it in detail please

1. Mahmoudco Scooters wants to estimate demand for the next two quarters for scooters in the market. Sales data consist of trend and seasonality. a. Quarter relatives are 1.4 for the first quarter, 1.25 for the second quarter, 0.95 for the third quarter and 0.8 for the fourth quarter. Use this information to deseasonalize sales for quarter 1-7. b. FIND THE FORECAST FORMULA. Estimate demand for periods 8 and 9. YOU MUST FILL THIS TABLE A manager has been using a certain technique to forecast demand for gallons of ice cream for the past six periods. CALCULATE THE ERROR USING THE MAD, MSE, AND MAPE METHODS