In Problems 83 - 86 , assume that the annual interest rate on a credit card is 19.99 % and interest is calculated by the average daily balance method. The unpaid balance at the start of a 30-day billing cycle was $1,583 .44 . No purchases were made during the billing cycle and a payment of $1 .583 .44 was credited to the account on day 21. Find the unpaid balance at the end of the billing cycle.
In Problems 83 - 86 , assume that the annual interest rate on a credit card is 19.99 % and interest is calculated by the average daily balance method. The unpaid balance at the start of a 30-day billing cycle was $1,583 .44 . No purchases were made during the billing cycle and a payment of $1 .583 .44 was credited to the account on day 21. Find the unpaid balance at the end of the billing cycle.
Solution Summary: The author calculates the amount of unpaid balance at the end of the billing cycle wherein a credit card's annual interest rate is computed by the average daily balance method.
In Problems
83
-
86
, assume that the annual interest rate on a credit card is
19.99
%
and interest is calculated by the average daily balance method.
The unpaid balance at the start of a 30-day billing cycle was
$1,583
.44
. No purchases were made during the billing cycle and a payment of
$1
.583
.44
was credited to the account on day 21. Find the unpaid balance at the end of the billing cycle.
2. Consider the ODE
u' = ƒ (u) = u² + r
where r is a parameter that can take the values r = −1, −0.5, -0.1, 0.1. For each value of r:
(a) Sketch ƒ(u) = u² + r and determine the equilibrium points.
(b) Draw the phase line.
(d) Determine the stability of the equilibrium points.
(d) Plot the direction field and some sample solutions,i.e., u(t)
(e) Describe how location of the equilibrium points and their stability change as you increase the
parameter r.
(f) Using the matlab program phaseline.m generate a solution for each value of r and the initial
condition u(0) = 0.9. Print and turn in your result for r = −1. Do not forget to add a figure caption.
(g) In the matlab program phaseline.m set the initial condition to u(0) = 1.1 and simulate the ode
over the time interval t = [0, 10] for different values of r. What happens? Why? You do not need to
turn in a plot for (g), just describe what happens.
The following are suggested designs for group sequential studies. Using PROCSEQDESIGN, provide the following for the design O’Brien Fleming and Pocock.• The critical boundary values for each analysis of the data• The expected sample sizes at each interim analysisAssume the standardized Z score method for calculating boundaries.Investigators are evaluating the success rate of a novel drug for treating a certain type ofbacterial wound infection. Since no existing treatment exists, they have planned a one-armstudy. They wish to test whether the success rate of the drug is better than 50%, whichthey have defined as the null success rate. Preliminary testing has estimated the successrate of the drug at 55%. The investigators are eager to get the drug into production andwould like to plan for 9 interim analyses (10 analyzes in total) of the data. Assume thesignificance level is 5% and power is 90%.Besides, draw a combined boundary plot (OBF, POC, and HP)
Chapter 3 Solutions
Finite Mathematics for Business, Economics, Life Sciences, and Social Sciences (14th Edition)
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