Amarket demand schedule shows: a how many units of a product individual consumers buy on a regular basis. b how much of a good or service all consumers are willing and able to purchase at different prices. c the additional total product that can be made by adding one additional worker. d the total cost of products and the number of workers.

I believe a market demand schedule shows how much of a good or service consumers are willing and able to purchase at different prices. It is the tabulation of the quantity of a good that all consumers in a market will purchase at a given price. There is an inverse relationship between the price and the quantity demanded, such that increase in the price causes a decrease in demand while decrease in price causes an increase in demand.

The answer would be 13.5 minutes.