Acollege bookstore marks up the price that it pays the publisher for a book by 35%. if the selling price of a book is $54.00, how much did the bookstore pay for this book?

$40.

Step-by-step explanation:

Let x be the original price of book.

We have been given that the a college bookstore marks up the price that it pays the publisher for a book by 35%.

The selling price of a book at college bookstore would be x plus 35% of x.

We are told that the selling price of a book is $54.00. We can represent this information in an equation as:

Therefore, the bookstore paid $40 for the book.

d. 24+-0.114

step-by-step explanation:

the question requires us to calculate the approximate 95% confidence interval for the mean number of ounces of ketchup per bottle in the sample given the following statistics;

sample mean = 24

standard deviation, σ = 0.4

sample size , n = 49

the confidence interval for a population mean is calculated using the formula;

sample mean ± z-score*(σ/sqrt(n))

the z-score associated with a 95% confidence interval, from the standard normal tables, is;

1.96

substituting these values into the formula;

24 ± 1.96*(0.4/7)

= 24 ± 0.112

from the alternatives given, choice d is closest to the above expression;