Six dozen pens were placed on sale for $8.99 each. after the sale, 2 and 1/2 dozen were left.
-how many pens were on sale originally?
-how many dozens of pens were sold?
-how many pens were left at the end of the sale?
-what was the overall sales volume generated on the pens sold?

1. 72 pens were sold originally

2. 6 dozen - 2.5 dozen left= 3.5 dozen pens were sold

3. 2.5 dozen pens were left qt the end of the sale

4. 72 pens to be sold

42 pens were sold

30 pens were left at the end of the sale

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.