If transportation costs include a car payment and gas, and Ryan's
car payment is $350 and he pays $100 for gas, what percentage is
Ryan paying for transportation costs each month if his take home
pay is $9,000?

5% is used on transportation.

Step-by-step explanation:

You have to do 350+100 for how much the total is for transportation. That is 450. Then do 9,000/450. That is 20. 100 divided by 20 is 5 and that is your answer.

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.