Sidney took a $400 cash advance by using checks linked to her credit card account. The bank charges a 2 percent cash advance fee on the amount borrowed and offers no grace period on cash advances. Sidney paid the balance in full when the bill arrived.
a. What was the cash advance fee? (Round your answer to 2 decimal places.)
Cash advance fee $
b. What was the interest for one month at an APR of 16 percent? (Round your answer to 2 decimal places.)
Interest $
c. What was the total amount she paid? (Round your answer to 2 decimal places.)
Total amount $
d. What if she had made the purchase with her credit card and paid off her bill in full promptly? Assume the credit card has a grace period. (Round your answer to 2 decimal places.)
Amount paid $

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?