Billal Company produces and sells automobile batteries, the heavy$-$duty HD$-300.$ The $2022$ sales budget is as follows.

$\backslash$table$[[$Quarter$,,],[1,,6000],[2,7000,],[3,9000,],[4,10000,]]$

Management desires an ending inventory each quarter equal to $20\%$ of the next quarter's sales. $($picture says $2032$ it is $2022)$

Required:

What is the opening inventory of the first quarter of $2023?$