Problem $18-26($Algo$)$

The following table shows the past two years of quarterly sales information. Assume that there are both trend and seasonal factors and that the seasonal cycle is one year.

$\backslash$table$[[$QUARTER$,$SALES$],[1,162],[2,185],[3,150],[4,130],[5,211],[6,240],[7,204],[8,179]]$

Use regression and seasonal indexes $($use Model II$)$ to forecast quarterly sales for the next year. Note: Do not round intermediate calculations. Round your answers to the nearest whole number.

$\backslash$table$[[$Quarter$,$Forecast$],[9,],[10,],[11,],[12,]]$