$\backslash$table$[[$Year $1,$Demand,Year $2,$Demand,Year $3,$Demand$],[1,12,1,16,1,14],[2,25,2,32,2,45],[3,76,3,71,3,84],[4,52,4,62,4,47]]$

a$.$ Determine the seasonal factors for each quarter.

$b.$ Based on the result of part $(a),$ determine the deseasonalized demand series.

c$.$ Predict the demand for each quarter of Year $4$ for the deseasonalized series from a six$-$quarter moving average.

$d.$ Using the results from parts $($a$)$ and $($c$),$ predict the demand for the shoes for each quarter of Year $4.$