An online store sells custom-printed calendars for $23.25 each for the first 30 calendars, dropping the price to $19.50 for each additional calendar, up to a maximum order of 90 calendars. They charge a one-time start-up fee of $35 for creating a new screen for printing the calendars. Let p ( C ) represent the price (in dollars) of ordering C calendars, including the start-up fee.