You want to carpet a 15 foot by 20 foot room. You have two carpet options to choose from. One is $1.50 per square foot and the other is $3.00 per square foot. How much more will your total bill be if you choose the more expensive carpet rather than the cheaper one? a. $52.50 more.
b. $105 more.
c. $450 more.
d. more than $500 more.

the answer is A because the cost of the more expensive one is 15+20=35 multiplied by 3 which will give me =$105

And the cheaper one is 15+20=35 multiplied by 1.50 = which is 52.5

so the amount more of the choice for the more expensive one is 105-52.5=52.5.

the answer is 52.50.

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.