For a fundraising project your math club is publishing a calendar The cost of the digital images and the permission to use them is 125 In addition to these one time charges the unit cost of printing each calendar is 3 25 Part a Write an equation for the total cost of the calendars Part b Write a model that gives the average cost A per calendar as a function of the number of calendars printed Part c Use the graph of the model shown below to estimate the number of calendars that must be sold before the average cost drops to 5 per calendar 25 22 5 20 17 5 151 12 5 10 7 5 055 in in 25 10 20 30 40 50 60 70 80 90 100 toolbar press ALT F10 PC or ALT FN F10 Mac T Y n t