The Lakeshore Hotel's occupancy-days and custodial supplies expense over the last seven months were as follows: Custodial Occupancy- Supplies Month Days Expense March 6,300 $17,940 April 7,700 18,110 May 13,800 24,240 June 20,500 29,300 July 24,900 32,820 August 17,400 25,470 September 14,800 24,090 Occupancy-days are a measure of the overall activity at the hotel. For example, when a guest stays at the hotel for three days, it is counted as three occupancy- days. Required: 1. Using least-squares regression (you may use a spreadsheet to compute the fixed and variable costs), estimate a cost formula for custodial supplies expense. (Round the "Fixed cost" to the nearest dollar amount and "Variable cost" to 2 decimal places.) Y = +