Question $10$

$0\mathrm{.}5pts$

Demand for a certain product is forecast to be $800$ units per month, averaged over all $12$ months of the year. The product follows a seasonal pattern, for which the Jaruary monthly index is $0\mathrm{.}8.$ What is the seasonally$-$adjusted sales forecast for January?

A$)640$ units

B$)798\mathrm{.}75$ units

C$)801\mathrm{.}25$ units

D$)1000$ units