Calculating inflation using a simple price index
which of the following, if true, would illustrate why price indexes such as the cspi might overstate inflation in the cost of going to college? check all that apply.
a. a new mobile device for personal computing became available for purchase.
b. professors required each student to buy 10 notebooks, regardless of the price.
c. energy drinks became increasingly popular on college campuses between 2010 and 2012 due to significant improvements in flavor.
d. as the price of calculators rose, fewer students decided to buy them, opting instead to use the free calculators in their cell phones or on their computers.

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?