HELP PLEASE!!!!

The question is: Carmella works 37.5 h per week for Century Home selling electronics equipment. She earns a base salary of $12/h and receives a commission of 5 cents for every dollar of sales she make.
Her chart goes like:
WSales($):Commission($): TotalSalary($)
0 0 -blank-
1000 50 -blank-
2000 -blank- -blank-
3000 -blank- -blank-
4000 -blank- -blank-
5000 -blank- -blank-
6000 -blank- -blank-

Then:Carmella's friends Maria and Sam work for two other electronics companies. The also work 37.5 h per week. Maria earns $8/h with a 10% commission and Sam earns $18/h with no commission.
a) One week, Carmella and Sam earned the same total salary. Determine each person's total sales and salary.
HOW DO I ANSWER THIS?! I TRIED TO DO THE ABOVE CHART FOR ALL THREE FRIENDS TO GET THE INFO TO GRAPH BUT THERE IS NO WEEKLY SALES I SEE WHEN SAM AND CARMELLA HAVE THE SAME TOTAL SALARY.
WHAT AM I DOING WRONG?!
I FILLED OUT THE CHARTS LIKE BUT FOR TOTAL SALARY, AM I SUPPOSED TO ADD THE PREVIOUS TOTAL SALARY TO THE NEXT ONE OR WHAT? PLEASE HELP ME WITH THIS QUESTION, PLEASE!

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The table shows the shipping-fee options for two online marketplaces. If you sell a model train car for $135, which is the lesser fee?

I understand that you are trying to answer a question about the total sales and salary of Carmella and Sam. Let's break down the problem step by step.

First, let's calculate Carmella's total salary for each row of the chart:

- For the first row, when her weekly sales are 0, her commission is also 0 and her total salary would be her base salary, which is $12/h multiplied by the number of hours she works per week, which is 37.5. So her total salary would be $12/h * 37.5h = $450.

- For the second row, when her weekly sales are $1000, her commission would be $1000 * 0.05 = $50. To find her total salary, you would add her base salary ($450) and her commission ($50), which gives $500.

You can use this same approach to calculate the total salary for each subsequent row, filling out the "TotalSalary($)" column in the chart.

As for the comparison between Carmella and Sam, you are looking for a row where their total salary is the same. You will need to compare the "TotalSalary($)" column for both of them and find the matching value.

Once you find the row where their total salary is the same, you can determine their respective total sales and salaries for that week based on the corresponding values in the chart.

Please let me know if you need further assistance or if there's anything else I can help you with!

on x sales,

c = 12*37.5 + .05x
m = 8*37.5 + .10x
s = 18*37.5

during the week, sam made 675.00
so, we need
12*37.5 + .05x = 675.00
x = 4500
c = 450(salary) + 225(commission) = 675