Gina went for a fun dinner at Sally's Savory Seafood with some friends. The bill
before tax is $45.80 and the sales tax rate is 6.25%. Gina decided to leave a 20%tip for the
waiter based on the pre-tax amount. How much tip will Gina leave and how much will the
total bill be, including tax and tip?

Tip- $9.16

Total bill will be $57.82

Step-by-step explanation:

Bill before tax is $45.80

6.25% sales tax implies 6.25/100 x 45.80= $2.86

20% tip = 20/100 x $45.80 = $9.16

Total bill is therefore $45.80+ $2.86+ $9.16

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.