Here are the sales data for the past 6 periods. It is known that a three-period seasonality exists.

Here are the sales data for the past 6 periods. It is known that a three-period seasonality exists. Assume the linear regression line for the deseasonalised demand is Y=486.14+55.96t. From these data, answer the following four questions.

PERIOD

ACTUAL

PERIOD

ACTUAL

1

300

4

416

2

540

5

760

3

885

6

1191

What is the forecast of demand for period 7?

Select one:

a. 460

b. 877

c. 890

d. 990

e. 1506