d$.$ What does use of the term sales rather than demand presume?

$3.$ A dry cleaner uses exponential smoothing to forecast equipment usage at its main plant. August usage was forecasted to be $88$ percent of capacity; actual usage was $89\mathrm{.}6$ percent of capacity. A smoothing constant of $1$ is used.

a$.$ Prepare a forecast for September.

b$.$ Assuming actual September usage of $92$ percent, prepare a forecast for October usage.