The quarterly sales data (number of copies sold) for a college textbook over the past two years are given below and apply Winter's method for forecasting based on

Year 1	Quarter	Sales
1	1	20
	2	100
	3	175
	4	13
2	1	47
	2	186
	3	295
	4	76

1. Determine and based on the given data.

1. Determine the seasonal index of Quarter 1 of Year 1 (S1) .

1. What is the level of January (L1) (Show your work using an equation)

1. What is the predicted demand for quarter 1 year 1?

Determine the seasonal index of quarter 1 year 2 (Show your work