High-Low Method Sophia operates a full service day spa in a small college town. Recently, Sophia rented space next to her spa and opened a spray tanning salon. She anticipated that the costs for the spray tanning service would primarily be fixed, but found that tanning salon costs increased with the number of appointments. Costs for this service over the past 8 months are as follows: Month Tanning Appointments Total Cost January 800 $1,748 February 2,100 $2,160 March 3,600 $2,840 April 2,600 $2,500 May 1,400 $1,800 June 2,300 $2,285 July 2,140 $2,300 August 3,000 $2,630 Required: 1. Which month represents the high point? The low point? High point March Low point January