The sales data $($in units$)$ of book store has been extracted for the three terms over $3$ years as follows;

Term$-1$Term$-2$Term$-3$

$20217800,6,000,4,500$

$20225,400,4,200,3,000$

$2023,3,600,2,400,1,200$

Required:

Using Additive index, forecast sales for term$-$II $($to the nearest $100)$ of the year $2024$ given an annual sales forecast of $8,100.$

A$.4,100$

B$.1,860$

C$.1,400$

D$.2,700$