The Business Analyst for Ace Business Machines,Inc $\alpha$ = 0 4,if the Forecast for Two Years Ago Was

Multiple Choice

The business analyst for Ace Business Machines,Inc.wants to forecast this year's demand for manual typewriters based on the following historical data:
Time Period :Demand
5 years ago :900
4 years ago : 700
3 years ago : 600
2 years ago :500
Last year :300
-What is the forecast for this year using exponential smoothing with $\alpha$ = 0 4,if the forecast for two years ago was 750?

A) 163
B) 180
C) 300
D) 467
E) 510