Bowser Inc. manufactures two models of speakers, Rumble and Thunder. Based on the following production and sales data for June, prepare $($a$)$ a sales budget and $($b$)$ a production budget:

$\backslash$table$[[,$Rumble Thunder,$],[$Estimated inventory $($units$),$ June $1,800,300],[$Desired inventory $($units$),$ June $30,500,400],[$Expected sales volume $($units$)$:$,,],[$North Region,$11,000,3,500],[$South Region,$14,000,5,500],[$Unit sales price,$$70,$$$90$