Bow-Wow Gifts can sell 30 puppy calendars per month if a calendar sells for $13, and they can sell only 22 puppy calendars per month if the price of a calendar is $19. Assume that the demand function for these calendars is a linear function. What is the monthly revenue from selling these puppy calendars if Bow-Wow sets the price of a calendar so that they can sell 24 puppy calendars per month? O a) $348.00 O b) $454.50 O c) $392.00 O d) $420.00