Refer to the following paragraph$($s$)$ for Qs$24-25$:

Here are quarterly data for the past two years to prepare a forecast for the upcoming year using decomposition:

Period

Actual

Period

Actual

$1$

$300$

$5$

$416$

$2$

$540$

$6$

$760$

$3$

$885$

$7$

$1,191$

$4$

$580$

$8$

$760$

Q$24.$ What is a final forecast for period $10$ using? What is a final forecast for period $12$ using?