A store owner bought a shirt wholesale for $35 and sold it in her store for $50. What is the percent increase?

Solution:

We know that:

We can make the following points:

Now, let's find the profit percent by plugging the C.P and the S.P.

Step-by step calculations:

Thus, the percent increase is about 42.86%.

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;