You purchase 3 cds for 13.99 each the sales tax is 4% you have 60 dollars, how much is your change?
a. 46.01
b. 18.03
c. 16.35
d. 45.45

Find the total of the 3 CD's by multiplying 13.99 by 3:

13.99 x 3 = 41.97

Now add the tax:

41.97 x 1.04 = 43.65 ( total of 3 CD's with tax.)

Subtract the total of the CD's from the amount you have to find the change:

60 - 43.65 = 16.35

The answer is c. 16.35

c. 16.35

Step-by-step explanation:

First we need to determine how much we spent before tax

We bought 3 CDs at 13.99

3*13.99 = 41.97

Now we need to determine the tax

tax = price * tax rate

tax = 41.97 * .04

tax =1.68

The total cost is price + tax

total cost is 41.97+1.68

total cost = 43.65

We have 60.00

The change is 60.00-43.65

16.35

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step-by-step explanation:

introduction, methodology, results, discussion

step-by-step explanation:

an observational study is one which consists of actual observation to record data and then analyse the data.

there are a number of factors that should be analyzed before starting an observational study.

the main four factors are:

i) introduction:   this should be analysed to check whether the purpose of the study is correctly established and the data recorded are appropriate for the study

methodology:   the method of collecting the data, such as whether randomly selected, and whether sample size matches with the population to be studied, whether questions asked are easy to answer by common men, etc.

results: then results such as summary of data with comments should be studied thoroughly

discussion:   the last is the discussion, this can be either by management people or persons who are all interested , etc.