Calculate Deseasonalized Demand $(1)$ for $t=4.$ Show answer to two decimal points.

Static Analysis $(p=5)$

$\backslash$table$[[,,$Deseasonalized$],[$t$,$Demand,Demand$(1)],[0,,],[1,10,],[2,12,],[3,13,],[4,15,],[5,17,],[6,25,],[7,28,],[8,30,],[9,32,],[10,20,],[11,15,],[12,14,],[,,],[,,]]$

$46\mathrm{.}4$