The ingredients for your braised ribs cost $11.32. You sell it for $20. What is your contribution margin?

How to do this , and can some one explain

Dakota earned $7.50 in interest in account a and $18.75 in interest in account b after 15 months. if the simple interest rate is 4% for account a and 5% for account b, which account has the greater principal? explain. to make it a little easier, there is an image. good luck!

Your food costs are $5,500. your total food sales are $11,000. what percent of your food sales do the food costs represent?