Problem $4-28($Algo$)$ Graphing; Incremental Analysis; Operating Leverage $[$LO$2,$ LO$4,$ LO$5,$ LO$6,$ LO$8]$

$[$The following information applies to the questions displayed below.$]$

Angie Silva has recently opened The Scarf Shop in Brisbane, Australia, a store that specializes in fashionable scarves. In time, she hopes to open a chain of scarf shops. As a first step, she has gathered the following data for her new store:

$\backslash$table$[[$Item$,$Amount$],[$Sales price per scarf,$$70$