In Problems 79-82, assume that the annual interest rate on a credit card is 25.74 % and interest is calculated by the average daily balance method. The unpaid balance at the start of a 28 -day billing cycle was $ 955.13. A $ 50 payment was credited to the account on day 21 of the billing cycle and a $ 5 , 000 purchase was made on the last day of the billing cycle. How much interest will be charged at the end of the billing cycle?
In Problems 79-82, assume that the annual interest rate on a credit card is 25.74 % and interest is calculated by the average daily balance method. The unpaid balance at the start of a 28 -day billing cycle was $ 955.13. A $ 50 payment was credited to the account on day 21 of the billing cycle and a $ 5 , 000 purchase was made on the last day of the billing cycle. How much interest will be charged at the end of the billing cycle?
Solution Summary: The author calculates the interest that will be charged at the end of the billing cycle wherein a credit card has an annual interest rate of 25.74%.
In Problems 79-82, assume that the annual interest rate on a credit card is
25.74
%
and interest is calculated by the average daily balance method.
The unpaid balance at the start of a
28
-day billing cycle was
$
955.13.
A
$
50
payment was credited to the account on day
21
of the billing cycle and a
$
5
,
000
purchase was made on the last day of the billing cycle. How much interest will be charged at the end of the billing cycle?
59. At a certain gas station, 40% of the customers use regular gas (A1), 35% use plus gas (A2), and 25% use premium (A3). Of those customers using regular gas, only 30% fill their tanks (event B). Of those customers using plus, 60% fill their tanks, whereas of those using premium, 50% fill their tanks.a. What is the probability that the next customer will request plus gas and fill the tank (A2 B)?b. What is the probability that the next customer fills the tank?c. If the next customer fills the tank, what is the probability that regular gas is requested? Plus? Premium?
38. Possible values of X, the number of components in a system submitted for repair that must be replaced, are 1, 2, 3, and 4 with corresponding probabilities .15, .35, .35, and .15, respectively.
a. Calculate E(X) and then E(5 - X).b. Would the repair facility be better off charging a flat fee of $75 or else the amount $[150/(5 - X)]?
[Note: It is not generally true that E(c/Y) = c/E(Y).]
74. The proportions of blood phenotypes in the U.S. popula- tion are as follows:A B AB O
.40 .11 .04 .45
Assuming that the phenotypes of two randomly selected individuals are independent of one another, what is the probability that both phenotypes are O? What is the probability that the phenotypes of two randomly selected individuals match?
Chapter 3 Solutions
Finite Mathematics for Business, Economics, Life Sciences, and Social Sciences (14th Edition)
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