Using High$-$Low to Calculate Predicted Total Variable Cost and Total Cost for Budgeted Output

Speedy Pete's is a small start$-$up company that delivers high$-$end coffee drinks to large metropolitan office buildings via a cutting$-$edge motorized coffee cart to compete with other premium coffee shops. Data for the past $8$ months were collected as follows:

$\backslash$table$[[$Month$,$Delivery Cost,Number of Deliveries$],[$May$,$$$63,450,1,800],[$June$,67,120,2,010],[$July$,66,990,2,175],[$August$,68,020,2,200],[$September$,73,400,2,550],[$October$,72,850,2,630],[$November$,75,450,2,800],[$December$,73,300,2,725]]$

Assume that this information was used to construct the following formula for monthly delivery cost.

Total Delivery Cost Number of Deliveries