couldnt do this need help asap

The manager of Snyder's Garden Center must make the annual purchasing plans for rakes, gloves, and other gardening items. One of the items the company stocks is Fast-Grow, a liquid fertilizer. The sales of this item are seasonal, with peaks in the spring, summer, and fall months.Quarter demand (in cases) for the past two years follows: Quarter Year 1 Year 2 40 60 2 350 440 290 320 210 280 Total 890 1,100 If the expected sales for Fast-Grow are 1,150 cases for year 3, use the multiplicative seasonal method to prepare a forecast for each quarter of the year. (18 marks)