Can someone explain to me what I did wrong here?

Sherri's 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 Month January February March April May June Number of Appointments 300 375 450 250 325 275 Total Cost $6,050 7,000 6,400 5,600 5,800 5,350 Using the high-low method, calculate the total fixed cost per month and the variable cost per tanning appointment. (Round your "Variable Cost per Unit" answer to 2 decimal places and "Fixed Cost" answer to the nearest dollar amount.) Answer is complete but not entirely correct. Variable Cost per Unit Fixed Cost 8.25 3,081 $