Parent Managed Calendars - Charge on a Sliding Scale

Rocky Mountain was hoping to charge families on a sliding scale regarding PMC. Right now, the system will only charge the one day rate when you select one to four days at a time from the calendar. And then with the "Use 5 Day rate as max amount:" room setting, they are able to charge a discounted rate when parents select the full five days of care in a week. They would like to have an option to charge on a sliding scale for use of 2, 3, 4 or 5 days. So for example if 15 dollars is the day one rate, they would like the system to charge 15 when only one day is selected, then charge 28 when two days are selected, then charge 39 when 3 days are selected, then charge 52 dollars when 4 days are selected, and charge 60 dollars when five days are selected.