Martin, who wants to sell a house he owns, authorizes his concierge, wilhelm, to find a potential buyer, and finalize a deal above a stipulated price. wilhelm contracts chris, a real estate broker, and instructs him to only find a potential buyer and send them over to wilhelm for the sale. martin then contracts renowait goodhouses, a home improvement company to renovate the house. renowait completes its work and martin pays them. chris then searches for a suitable buyer and finds one in george. george buys the house and chris is paid for his services. who performs the role of the agent in this land sale transaction?
a) wilhelm
b) martin
c) chris
d) george

Areal estate agent is considering changing her cell phone plan. there are three plans to choose from, all of which involve a monthly service charge of $20. plan a has a cost of $.42 a minute for daytime calls and $.17 a minute for evening calls. plan b has a charge of $.52 a minute for daytime calls and $.15 a minute for evening calls. plan c has a flat rate of $80 with 275 minutes of calls allowed per month and a charge of $.38 per minute beyond that, day or evening.a. determine the total charge under each plan for this case: 150 minutes of day calls and 70 minutes of evening calls in a month. (do not round intermediate calculations. round your answer to 2 decimal places. omit the "$" sign in your response.)c. if the agent will use the service for daytime calls, over what range of call minutes will each plan be optimal? (round each answer to the nearest whole number.include the indifference point itself in each answer.)d. suppose that the agent expects both daytime and evening calls. at what point (i.e., percentage of total call minutes used for daytime calls) would she be indifferent between plans a and b?