Answer:
JANUARY = 218.28
FEBRUARY = 184.8
MARCH = 207.36
Explanation:
Trend component of demand equation :
Ft = 90 + 6t, where t = 0 in June of last year
Seasonal relatives are ;
1.07 for January
0.88 for February
0.96 for March
Forecast for January, February and March of next year:
JANUARY :
last year June, 't' = 0,
[last year - this year - next year]
Therefore January of next year, 't' = 19
Ft = 90 + 6(19) = 204
Forecast = Ft × seasonal relative
Forecast = 204 × 1.07 = 218.28
FEBRUARY :
Therefore January of next year, 't' = 20
Ft = 90 + 6(20) = 210
Forecast = Ft × seasonal relative
Forecast = 210 × 0.88 = 184.8
MARCH:
Therefore January of next year, 't' = 21
Ft = 90 + 6(21) = 216
Forecast = Ft × seasonal relative
Forecast = 216 × 0.96 = 207.36
