Can someone please help me answer these economics questions, thanks

• TV and radio networks offer "free air" for public service announcements. What is the cost of this "free" time for the station? Why are there more public service announcements on Sunday than other days of the week?

OR

• The acres of grass surrounding the Taj Majal in Agra, India are often cut by young women using kitchen shears instead of lawn mowers. Is this a low or high cost way to cut the lawn?