Answer:
$143
Step-by-step explanation:
The computation of the demand forecast is shown below:
= Weightage × demand observed + Weightage × demand observed + Weightage × demand observed
= 0.1 × 120 + 0.4 × 140 + 0.5 × 150
= $12 + $56 + $75
= $143
Basically we multiplied the weighatge with its demand observed so that the demand forecast could come