M$5-10($Algo$)$ Estimating Cost Behavior Using High$-$Low Method $[$LO $5-3]$

Tan$-$O$-$Rama is a local tanning salon. The following information reflects its number of appointments and total costs for the first half of the year:

$\backslash$table$[[$Month$,\backslash$table$[[$Number of$],[$Appointments$]],$Total Cost$],[$January$,500,$$$6,400$